Making the Shift from Marketing to Sales

My position at my company (startup business) is mainly on marketing, but my team is slowly shifting towards sales in order to deal with recent cutbacks. However, I don't have much practical experience in sales, and wanted to learn as much as I can before I take up the role. I've heard about training programs and the like (here's an example), but I'm looking for more cost-effective solutions. Does anyone have any recommendations on good resources on how to train on sales?