You need to decide if you want small community fish. Decide What your favorite fish is, so you can build a stocking plan around them.
Ex: if you know you are going to want Neons, don't buy anything that might harass them.
I often started with Cherry Barbs 2m1f. Or Harlequin Rasbora.
Are you going to want plants ? Just throwing fish in haphazardly can end badly.
Avoid Plecos and Chinese Algae Eaters. Both get large and Plecos have big bioloads and CAE
Decide what size tank. 10g are nice but limit choices. I love my small tanks, but a 20g or 30g give you a lot more choices.