You should make a buyer request, then you’ll get a range of offers you can review. Not many sellers use the forum so you’re limiting your choice somewhat. It is a good way to get to know sellers by reading or participating in forum posts, but you would have to do some research into which sellers sell what you need.
Alternatively you may want to do some initial research and get a shortlist of possible sellers, then ask them all to do something small and cheap so that you can see how they communicate, if their style meets your requirements etc.
Whatever method you pick, good luck with your project.