Okay, since you're a Piano Player to Guitar Player, I can relate. I took piano for... ten years almost, and then I quit and played on my own. For a long time I knew the basics of the guitar, pretty much what each note is and that 1 fret = 1 semitone, and if i thought hard enogh I could transcribe some simple melodies.
Then, I actually picked up the guitar properly and taught myself using what little knowledge I had. You should know intervals, harmonic/melodic/natural minors and major scales already, and maybe even some modes (phyrigian, mixylodian, etc) and try to apply those to the strings. While learning how to a do a one string scale is useful, it isn't hard. Just follow that pattern you were taught, TTSTTTS, etc and convert one tone to 2 fret jumps, and 1 semitone to a single fret. It is quite easy to get the hang of, obviously, but it's not much use when you actually start playing. Squish that scale into a small number of frets, say 4-5 on just a few strings, work it out, I did. Just use your ears (remember i'm basing this on the fact that you can play piano, and I hope you mean 'play piano' as you know what you're doing) and get the hang of your four basic scales on a few strings. Try not to touch the B string yet as that'll offset your whole mind pattern you're trying to form.
As for chords, just google them and get the tabs. You can figure out the chords yourself, I did that until I realized it's just easier to find them. After getting the open chords down it's just a matter of barring it and sliding up and down the fret to find the note you need.
Try to learn guitar by ear, I play in a Jazz Fusion band as well as some Instrumental Rock, and I can't read notes nor tabs for shit on a guitar. You ask me what Key i'm in, and i gotta look down and count the frets.
But i can play. That's what piano has taught me.