One nice thing about being a hobbyist breeder is that you have a lot of time to get things together (unless you are planning on buying adult/breeding size females from the start). Since you're new to BPs, I'd focus on learning the genetics and combinations and "buying high" so to say when it comes to the genetics of your snakes. The last thing you want is to have low-value normals or single gene snakes that you can't sell. Getting multiple gene combos or visual recessives that will produce a more or all highly desirable offspring is a good goal.
Invest in a sub-adult/adult male rack now to grow your BPs in. You won't really need a big V70 rack until your females really get big (which is likely 3 years away if they are babies now). Then you can get a hatchling rack when you know babies are on the way. I bought all my racks from reptile basics and struggled keeping the temps correct in my old unheated house. Keep this in mind as the best thing you can do for keeping a collection of BPs is to have them in a single room heated to your desired ambient temperature. Since I have moved, I now have a house with central heating and a bedroom dedicated to my reptiles with a dedicated space heater to keep it up to temp. Since I have done that, I have bred my first two clutches with great success.
Lastly, decide how much you want to get into breeding. Some people do it as a business and others do it as a hobby, and there are many shades in between those two as well. I worry about the sheer amount of people buying and breeding tons of BPs. Considering how long they live and how reptile keeping is not for everybody, I feel like we don't need any kind of breeding focused on quantity.