This may be a silly question, but if I sell some ad space on my blog directly to an advertiser (e.g. one month of a banner ad showing in the sidebar), should I invoice for the payment at the start of the month? Or at the end after their ad has ran?
Should I actually expect any money before I put any ads live? Or should I be happy to be paid afterwards?
This is my first experience of selling directly (I usually use Adsense) so any advice would be greatly appreciated.