These are just my thoughts on the subject. Use them as you will.....
Well, first remember to have lots of patience. Next, you will need $$ for the greenhouse and all the stud plants and materials. My advice is look at your longterm goals. There are many players in this game and they have lots of money backing them.
Start out sending your crosses to a reputable service for flasking and compotting. Catts and paphs have different requirements and you will need to provide excellent conditions for both. Join an orchid society if you have not and get into the show circuit. Go and display your plants in the society booth and then eventually in your own display. Meet the people in your region that grow and breed orchids at the commercial level and ask lots of questions.
Volunteer and learn first hand about harvesting seed and flasking. Learn as much as you can about the process before jumping in head first.
Good luck to you!