Start with 10 Party Sing-Along Songs You Should Know on Guitar! (34 min, JustinGuitar), then How I Learned Guitar Without Natural Musical Talent (29 min, Marty Music). All 871 lessons here are free, from the teachers' own official uploads. You'll need beginner acoustic guitar, clip-on tuner, capo and a few more basics (about $230 of kit). The book to keep beside you: Fretboard Logic SE by Bill Edwards.