Oh hey! Welcome to PC! :)
You've got the right idea, but you might be in the wrong forum. You want to be in the
ROM Hacking section, I think! They have great resources and stuff specific to rpg projects and such, so if you need help in that area, I highly recommend it! Unless you'ere not looking for sprites specific to a pokemon hack, in which that would be a different case. I also recommend asking either
Christos or
Spherical Ice for help, as they're the moderators of ROM Hacking and would know much more than I do!
Unfortunately, request threads like this aren't actually allowed in A&D. :< If you need something, you should go to a thread with the

prefix, and make your request there, Just make sure you read all the rules the artist has assigned for requesting first!
I'll leave this open in case you have any questions, so we can try to help you out. If you need a hand in anything relating to this thread, or just navigating PC in general, don't be afraid to ask! :)