Should I consider opening a pet shop? I want it to be a great one...please read details-its long though-sorry!?

Sure, why not? It's up to you not us, if you have enough money go for it :) but yes there is a possibility you would go broke in a few months, and buying animals from breeders would be more money than selling the animal. You will just have to take a risk, but your dream petshop sounds like a shelter.....maybe you should open up a shelter? You would be saving animals instead of selling them :)