Her first wash

Hey guys I recently purchased a rx7 and man it's a dream come true I love this car but I seem to have some electrical mishaps going on. For some reason the dash lights will go on and off. My cel would pop on if I wasn't giving it gas (fixed it by adjusting the throttle) first gear recently gave out but I have another transmission to put in it. Any advice on swapping it if I want to do it myself? And I need to pass emissions since I bought it out of state and I'm not sure what to look for to make sure it passes. I just found out about pre mixing and I'm confused about that whole situation. The guy I bought it from said it has 80k on the new motor but we all know people will say things for it to sell. I really look forward to getting into the circle. It's a n/a 13b that has a stereo system so it's nearly bone stock.

And I want to start building it so it can be a bit faster so any suggestions would be great

thank you I'm trying lol