You sound like I did when I started a couple years ago.
I did build my coop with 2 separate people doors and a temporary wall to separate birds, more for integration than breeding,
but I also dreamed of getting some Ameraucana, Marans to have a varied basket of striking colored eggs and to make Olive eggers.
That coop partition, as I call it, with it's separate run has been invaluable as have the 4 (2 lg,2 med) folding wire dogs crates to segregate and move birds for behavior issues, transport, harvest, etc. Wish I had several more of the medium sized crates also.
What I've learned in 2 years of keeping chickens and raising/hatching chicks:
-I wish I had 3 or 4 or 5 or 6.... separate pens, for secluding pure breeds, secluding chicks until old enough to integrate into main flock, containing randy extra males until harvest ready, separating broody hens, etc.
-Finding pure breed birds is difficult and very expensive, everyone has Ameraucana and Aruacana-but most are not pure, those names are used freely and inaccurately. You can find good breeders out there but you will pay dearly for pure birds(understandably so) and probably shipping them.
-Having harvesting equipment, and gaining the skills to use it, is essential if you're going to hatch chicks, you can sell or give away a few males if you're lucky, but you have to deal with the rest, eating them is the best answer IMO.
-It takes a long time to realize your efforts, 21 days to hatch, 6 months until eggs.
Keeping chickens is pretty easy once you have some experience and good housing/equipment, but it takes patience.
I suggest keeping the birds you have for a year, big learning curve that first year, meanwhile research breeds and breeders, incubation, integration, quarantining.
At the end of a year you'll have a much better feel for how to keep birds, what kind of housing you can facilitate, and what your chicken goals really are.
Just some thoughts.