That said, lets see how we can think how a race can evolve from standard animal to sapient dominant species.
In this case, Reptilian. No I am not a biologist, just watched too many nature documentaries. That said, I think this is a fun idea so how about we think what we would need for, in this case, a reptile of some sort such as a crocodilian or lizard to become a advanced civilization such as how an ape had a lineage that would lead up to humans.
What traits would fall away, and what parts to quote Ronanke Gaming "Good Enough Nature" where nature doesn't change something to something more advantages (say air tube and feeding tube not as close together in humans) because its good enough and doesn't need to change.
So what are some real animals we can get some inspiration for this new reptilian race on say the Silurians (Doctor WHo), Dragonborn (Dungeouns and Dragons), Angorans (Elder Scrolls), Gorn (Star Trek), Zettaran (Mortal Kombat), Lizardmen (Warhammer) and more.
From what little I understand, I think we need the following: Tool Use, Intelligence, high sociability, being good parents, and language need to happen. However that describes Dolphins and Chimps, so I will need help coming up with an X factor to make them go from this to caveman lizard people to space faring. And for fun why limited it to this? Turtle, Tuataras, snakes, protomamals, and more! Go!
Something social needs to happen. We don't think of most reptiles being social animals, but large number of them can be chummy. Going of Casual Geographics, Alligators give each other piggyback rides just for funsies. A number of snakes don't mind hibernating or hanging out with each other, and more. So in part, a few generations more of this in a more advance direction might help them out. Komodo Dragons even have a hiarchey based on who's the biggest.
Many already communicate well enough. While a large amount of human communication is done with the face (we have almost 40 muscles for expressing emotions alone) other animals have other means, such as infrasound, ear and tail movements and more. In the case of Crocodilians, the grumbling growls they make, many at a pitch we humans can't hear, help in this regard. You can see this in mating season when the males will make their infrasound calls to impress potential mates, making the water dance on their backs from it alone. I can see also a Chamelian's use of color changing. While many for the longest time thought it was for camouflage, it turns out its a form of communication and indicating they are feeling this or that way. And of course various ways many try to one up each other to attract the opposite sex (Alligators singing Green Anoles red throat pouches).
Parenthood...could use some work. Most abanon their eggs or live births soon after laying and hiding or burying the eggs. A number will even eat their young if given a chance. Most are not the parent of the year material, but there are exceptions. Crocadilians such as crocodiles and alligators will have mothers protect their nest, help break open the eggs when the mother hears her babies calling, and even gently carry their young to the water. There unless something horificly goes wrong will try to protect them from predators such as birds and other crocodiles (that may include their own father). Male Gharials, the crocks with the long narrow snout and big nose, buck this trend and can be just as nurturing and protective of the babies as the mother (with a world famous photo of one dad giving a 100 of his babies a piggy back ride).
Shinglaback Skinks from Australia, another animal that is one of the few not trying to kill you from the land down under, has a unique armored look and a short stubby tail. They will stay close to their mother for over half a year, and when they do move out of the basement have a territory that is close to hers.
Pythons famously wrap around their eggs and even shiver to keep them warm.
A combination of this, as well as longer nurturing periods might be needed to in a long run.

Intelligence is simple enough. Many are already pretty smart. Alligators and crocodiles have a small brain to body size ratio, yet can learn tricks, have favorite humans, and even recognize their names. They also learn and a number of people have been killed because they didn't realize one of the swamp puppies was studying them. Others such as monitor lizards and tegus have been shown to pass several tests and challenges of memory and learning. I have seen a box turtle jump off a ledge in its encloser right itself, and then keep doing it because of the fun factor. Same with blowing bubbles when I let it have a soak. Other reptiles are also known to have a personality, favorite human, be affectionate, and do ticks. SO why not?
Finaly tool use. Be it simple such as a rock or a twig to get what they want, the ability to make and use tools is a sign of intelligence for many humans when looking at other animals be they birds, primates, dolphins (they will use sponges to get some spikier foods) and more. That said this isn't the only thing, there is not a race of super advance sea otters for instance running the planet (and now I want to see that in a story), but tool use and are ability to make use of it in interesting ways allowed humans to rise above the rest of the animal kingdom and dominate the planet (that and the ability to thermo regulate better and run prey down by exhausting them).
The next question would be how do they view things? Will it be different from how we do it, or will there be similarities? We are far from a monoculture though we have several similarities that span time and location, so why would they? Thoughts, ideas, and how do you think they would work?