AoS 1k start collecting force

It is OK, but don't expect too much from that list.
I also played it when I started and I did win a game or two, so you will probably fine, but for the future you will probably have to make the decision: Go Saurus or go Skinks.

Also: Since units of 20 Skinks don't do a lot you might just as well split them up into two units, and merge the Saurus Knights together to one unit. The latter will hit harder that way, and half of the Skinks can many times retreat and not get hit.

 

It can work, the problems are as follows:

To be really effective Saurus need their heroes, like a Sunblood or one of the Scar-Veterans, maybe even as the General, or as part of a Bloodclaw Starhost, because of their command abilities.

Skink Hero abilities are - mostly - more general, they can buff both Saurus and Skinks (Serpent Staff, Celestial Rites, and magic) and they synergize with the Stegadon (Skink Alpha ability) for example. Skinks also have 25mm bases which means they work rather well as chaff to hide behind, but still having the option to attack over them, which also makes them synergize better with monsters.
They are also an important part of some of our most effective lists, like Kroaknado or Shadowstrike.

Saurus practically only work in big blobs, while Skinks have their uses in smaller units as well.
So for Saurus it generally means "go big or go home".


That being said: It depends on the list. Mixed lists can be effective, I just think it is harder to do, especially if your goal is to go to tournaments.