it seems like a great idea, the best way to start "a small blog" and do some affilliate relating to what you are writting about. as far as advertising do it for free and it calls "viral advertising" if you worry about money now, this type of business is not the way to go, but if you do it with patience and give people great advice and make the website and your topics interesting something that people can relate to then that is the way to go. money should not be your worry if you are doing something that you love. one day it might take you somewhere you never thought of. don't give up