what should I build?

Its my first time playing since a long time and Ive got:

Charizard: slash, flamerhrower, ember, fly

Gyarados: Thunder wave (i dont really like it tbh), Hyperbeam, return, dragon rage.

Hitmonlee: rolling kick, high jump kick, seismic toss, focus energy.

Vaporeon: water pulse, surf, protect, toxic.

Ive also got two 25ish leveled Snorlax and Exeggcute but i dont know ehat to build around, what pokemons fit best my team or what attacks to change. Thank you!