just do the betta for now. getting other fish now may backfire your plan. go slow and easy, and educate yourself. this is the best advice. also make sure you have everything you need first. meds,good food ,heater,and water testing kit. these are all things needed ,not optional. nobody benefits when you go too fast. stocking your 10 gallon will be that much sweeter. you will have real time to plan it out. i am putting a 40 breeder together,at a snails pace. i want to execute my true vision for this tank.i could put it up today if i wanted to. it would still be beautiful, but not nearly as nice as it can be. my ideas for it also change daily,so i started keeping a set-up journal. it also(aside from visual tank plans)contains websites, product pricing and pictures of the plants, rocks, etc. i want and info about them.