Good morning, welcome.
You ask a very, very complicated question and rather than to go into great detail with breeding advice, I would first suggest that you check various dog breeding sites, because responsible breeding is not limited to Labradoodles...once you determine that breeding is for you, then you begin to look into the Labradoodle crosses available and the benefits/drawbacks of each.
Here are some of the things that took me by surprise:
Expense (I have paid nearly $30,000 and have produced only 2 litters to date.)
Location (we moved from the city to the mountains to accommodate 4 dogs)
Time (this is much like raising babies, you need to be constantly aware of them and training them, and you form a great bond with your vet!)
Responsibility (huge topic here, but basically, you need to find out what to do to provide the best possible start for your puppies, and to honor your commitment to the buyers)
Emotional drain (again, like children, you worry over you dogs, you get upset with their health issues, you thrill for the healty birth of puppies, and mourn for those not so healthy...and cry when they are ready to leave.)
You will, at the very least, need to make sure that your breeding dogs are not genetically weak, so you will have to conduct (again, at a minimum) hip and eye testing. You will also offer a health warranty, so your first few litters, the money will need to be saved in the event that one, or all, of your puppies become serious ill. (Not likely, but possible, and you must be prepared.)
This forum is a good starting point, as are many of the other Labradoodle forums, I would suggest that you review the archives and if you do decide to go further, please contact me. I'll be happy to help if I am able to.