Mach44
It is nice to hear that you are keen to become a flying instructor because you wish to be involved in the teaching process. Like Pilcher say you did used to be able to become an instructor with only some experience and a PPL. Currently this is not the case and you require at least the 9 CPL written exams passed before doing the FI course.
At this moment and time Flying Instructors are very much in demand and you should have no problem finding work, Instructors are becoming fairly scarce because of the upturn in commercial aviation and most guys have a lot of debt from completing there licenses. Instructor pay is not great but is a lot better than it was. There is a thread on FI pay scales which makes for interesting reading. Most schools are looking for full and part time instructors and a good tip is to try and get in to a busy school where the work will be plentyful and constant. This will help you when you start.
Instructing is great fun and as Pilcher says be prepared to meet all types some great and some not so great to teach.
Good Luck