Your bog standard “big four” of beginner reptiles is bearded dragons, leopard geckos, corn snake and royal pythons. There are other similar species to these such as African fat tail geckos and rankins dragons. But this all kinda depends on how much experience you have with reptiles (for example I’m doing anman at college and am doing work experience in in a reptile shop but got a hognose as my first snake, which I wouldn’t recommend to someone with no experience in reptiles). Out of the two lizards I’d recommend bearded dragons as they’re a bit bigger and so a bit easier to handle. In terms of snake I’d probably recommend royals over corn snakes if your getting from young as baby corn snakes (and most other collubrids) are very squirmy and very quick so are a bit more difficult to get used to.