Here are my thoughts...
1) Find a mentor that will be able to help you throughout the journey...if this mentor has done it before that would be ideal
2) Get educated...Get enough information to start taking action...and make sure to run everything by your mentor
3) Have a "Why" for doing your business and keep it in front of you everyday.
4) Have an exit strategy...Do you want to build it and sell it?...Or keep and control for cashflow?
This is what I could think of off the top of my head...What does everyone else think?
"Whether you think you can, or you think you can't either way you are right!"