Form field data pulled from database

[eluser]mdcode[/eluser]
Another newbie question from me...

I've tried to search for this and look at other examples but I jsut can't find anything relevant to help me in my case. I have a form that I am attempting to convert using the form helper (which is autoloaded) and I need to populate certain fields (all of them seem to be select fields) with options from the database.

So I have a table in my database listing customers. In that table I have customerid, and customerName fields, and I need to populate a drop-down with the customerName displayed, where it would input the customerid into the database.

I've tried doing this myself and it's not doing anything...