Wannabe

I need some advice on learning the Guitar. This is my second or third time around on plying the Guitar. I don't want to get stuck as I have done before. I've learned to read a little tablature (the "A" pentatonic scale) from one instructor, and a little by ear from another. It's been about a year and a half since I've been serious about this stuff. The by ear was cool and all, I was in the proses of learning to move around from key to key with minor and major pentatonic. Hard times hit and can't afford a teacher. When you change instructors it sets ya back and I ain't no spring chicken (in my fifties). It seems like I'm just plying into the air here with no real plan of attack. Any suggestions? Thanks