I'd suggest you get hold of
this book and study what makes an aeroplane fly and what all the bits do. That'll keep you busy for a couple of months. Although its not free and involves spending some of your own money, you'll have a book that will always be handy. I still dip into my own second edition of Kermode for refreshers, even today.
You'll also need to brush up on that vitally important skill for an aircraft engineer in the RAF - the ability to drink eight pints of lager and get back to the block without falling over.
You have to be mad to spend your life messing about with aeroplanes, but I've found it worthwhile and I don't regret anything. (Except perhaps, that time in the Bangkok whorehouse, but that's another story...)