Hello Angel and welcome to BYC! Take @sourland's advice and read up on flock integration. It can be grueling. You asked about your coop. You might want to post your approximate location then look at the threads on coop building to give you a better idea of the basics of a healthy coop and run for your chickens. Best of luck to you.
Hi, Angel, and welcome to BYC! So excited you joined!
Best of luck with integrating your flock - one thing that I've learned is that you don't want to rush it, if at all possible, as things can get pretty rough if you do.
Make yourself at home in this amazing community!
The best time to integrate birds into another flock is when they are about the same size. If you try when they are too small some may be killed. They will establish a new pecking order. You will find a lot of good information here Good luck with your birds and have fun...