Well, you're in Kanto, so if you plan on taking the gym challenge, you're gonna want to grab some types effective against rock. Your starter's a decent start, but if you can, I'd seriously recommend getting a water type egg from the Breeding Center; they give freebies to newbies.

[Assuming she hasn't claimed hers already.]

Also, you should try catching a variety of types. And don't be afraid of letting them train on their own or make their own decisions in battles; giving orders is a good way to start, but since not every trainer does, there might be cases where you and your Pokémon need to think on the fly.

[With that said, he'll go ahead and attach links to the Breeding Center and his Training Guide.]