There's an almost infinite combination of answers to strains & places to buy them.
Just grab the beans of whatever strain(s) tickle(s) your fancy. Example: I'm currently growing a Durban Poison fem from ILGM, while I still dispute how true the genetics are to being Durban, it's a really nice plant & is starting to develop that nice old-school citrus-pine vibe I remember from my youth. Another example: I'm growing an OG Kush from from i49, another "generic" seedbank, but MY GOD the plant reeks in veg and is just doing amazing.
To get started, just to slim things down, focus on the strain and not so much the breeder or bank. Then, after many successful grows, explore the World for the real deal if you didn't already obtain it.