Make a list of what projects you would like to do and then you need to find out in what order you need to do them.
For example, don't install a new tile floor in the bathroom and then decide to replace the tub.
Like Supergirl, you also will need to be able to look through walls before you tear them down or cut into them. Where are the wires, the plumbing, and what is a suporting wall?
Buying a saw and a drill is great but, if that was all you needed to do the projects you mentioned, every contractor would drive a Yugo! (Well except for the really macho ones, they would have a Honda civic)
I like your spirit but, if you dive head first into this without doing your home work, your spouse will be right! Home improvement projects have got to be high on the list of why couples split up.
Take the advice of the rest of the crew and read the books and try to apprentice with a contractor for awhile, (everybody knows help is hard to find). Read the For'em every day, every post,and you will learn. You will also learn "who" to listen to and "who" might be just causing trouble. But remember, we are here for you.
Good luck, Jason (inspector)
ps. Does the hair on the back of your neck stand up when you walk into the hardware store?