If you can find an hour a day, you can spend one or two of those hours every couple of weeks with a teacher. It will be worth more than all the books you can get.
Not to leave you high and dry, here's my picks:
George Vance,
Progressive Repertoire for the Double Bass Vol.1. This comes with a CD with recordings of some of the exercises so you can hear what you are supposed to sound like. You will need a bow and rosin and a music stand to properly "go by the book". A metronome is also useful so you can practice in strict time. Most exercises have a specific tempo. Also the
Yorke Studies for Double Bass Vol.1 is good to develop specific positions and sight reading.
Both books assume that you understand a little music notation and theory. If you don't,- get Paul O. Harder's
Basic Materials in Music Theory also.
Also stick Double Bass Pedagogy into Google. I don't remember where, but one American university web site has downloadable movie files illustrating the various bow strokes.
Now, GET A TEACHER!
