Hi Tammy Jo, Welcome! I can only offer what works well for me, and that is a combination of both power and hand held (nonpower tools). The size of burrs you will need will depend on the size your carving is. I am a big fan of the ruby carvers for detail work.
Does your project talk you through, step by step? If not, you should consider buying a book that does.
Don't worry, we were all once at the stage you are now, you'll learn what works best for you very quickly! And we're all here to help you along the way!

Deborah