What do you mean by "professional"?
But to answer your question:
1) You might want to spend some time reading here at the Library. A good place for you to start might be the Dominants dungeon.
A few threads that might be of interest:
Training
Question about romance
What's fair when pushing limits?
On Being a Dominant
What makes you...
Ask a lot of questions, dont be afraid to admit you were wrong, learn from it and move on.
2) Be prepared for a LOT of studying, responsibility and a constant pressure of awareness.
Another human being is placing themselves into your hands. You have to be aware how you every action is going to affect them psychologically and physically (believe me, even the most seemingly easy and innocent thing can cause damage). If you are not into it, this can seem like hard work.