I've played on and off for 20 years. Less the last few years, because to keep my chops up and to be able to play the way I like, it takes too much time away from the rest of life.

Learn the basic barred power chord, and get comfortable moving up and down the neck and across the 3 big strings. It sounds good as soon as you play it right. Just put your index finger on any fret of the biggest string. Then put your ring finger on the next string up, 2 frets down. For example, 6th string, 5th fret/5th string, 7th fret. Only hit the 2 strings your fretting. It works anywhere on the neck. This basic chord is good to learn first, as it will keep your interest perked when other, more complicated chords frustrate you. You can always take a break from what your trying to learn and bang out some power chords to keep it fun.