I'm trying to do a bulk import of leads and on step 3 it asks me to choose an Acqusition Program. When I click the drop down there is nothing listed and Marketo is not letting me type anything into this box to proceed.
Do you have any Programs in Marketo? sounds like you do not.
The Acquisition Program is NOT required. It is mostly helpful if you are importing lists into Tradeshows or other events. So if you really want, go create a Program and then come back to Import List and it will appear there. Just remember this Program will get credit for ANY new leads you import.