Welcome to the forums! Before you post, use the search bar(magnifying glass at the top) to search for posts that discuss similar topics. I answered a question like this very recently. Making a 6 wheel drivetrain
The best resource I can give you is this:
Catalogue of Drive Gearings
If you are a first year team then I would recommend a slower gearing, no faster than 60 in/sec. Hope you find what you’re looking for! If you have any other questions, feel free to ask!