I keep finding myself saying this but I don't think you need to spend your hard-earned $$ paying someone to teach you basic music theory on notes, scales, intervals, chords, rhythm, harmony etc...
excellent info on all this stuff is available freely online (Google 'music theory' and have a look) and from dozens of happy-to-help people here (all you need to do is ask)
if money is no object, then go ahead & get a teacher who'll show you what a triad is etc, but it's a lot of money for info you could have got for free... rudimentary music theory is not rocket surgery and I disagree with the last poster, a book would be a perfectly good substitute for 99% of people wishing to start understanding music theory