Welcome to BF. This subject has been extensively discussed here and at
www.crazyguyonabike.com. You can do subject searches on both sites and glean a wealth of info.
Depending on how disciplined and skilled you are, you can tour on as little as $15/day, by never paying for a campsite(stealth camping.) Practice the craft by doing a few overnighters. (Bums on bikes tour on even less, but that's another subject.) Oh, check out
www.warmshowers.org.
Have fun.