find a shop where you live; a lot of places will rent to own. pick up the phone and call. learn scales and positions right away – especially if you haven’t played a fretless instrument. get a tuner to check your notes against… THEN move to songs.
when you fingers start to bleed from playing pitz, grab a beer and keep playing. if it gets bad, switch to arco. the first month my hands ached every night, but it was well worth it.
