Hi and Welcome to YT !!!!
First step is RESEARCH-RESEARCH-RESEARCH
Do this before buying your female. Also there are LOTS of DVD's and books on breeding and whelping. Lots of very helpful websites as well.
Also if you have a mentor it is VERY beneficial. Maybe see a couple litters whelped, etc.
There is LOTS LOTS LOTS to learn. Take your time, do your research, and good luck to you!!!!
And again, WELCOME !!!! You'll love it here!!!!