As you know nothing of the industry then join a big national company and get the training etc for free. It will cost you over a grand for the basic BPCA course which lasts 8 days! Owning a few ferrets and birds ain't pest control mate, thats a hobby They can be integrated to pesty work but that won't put alot of cash in your pocket on their own. I joined a big national 3 years back and have plenty experience behind me on most pests, you wouldn't make any cash to pocket in those 3 years going it alone.
It's a lot of graft but a very rewarding job, people are always pleased to see you