The original post doesn't specify whether the accordion in question is a diatonic button accordion (melodeon) or a piano accordion, and if the latter, whether it is a free bass or stradella style. Very different bass techniques required, and consequently, different ways of controlling the beast!
As the previous post recommends, have a look on Youtube, though not necessarily for lessons, but skilled players of your particular type of accordion and style of music that interests you.
Good luck!