I am fairly new at emrbroidery myself (have a Babylock Ellegante that I got last Sept). I don't know anything about the Bernina software, I use Janome Digitizer Pro.
A great site is
http://www.emblibrary.com/EL/default.aspx; I was recommended to them through Janome's embroidery forum. Not only do they have a lot of beautiful designs, they have a lot of tips and how to advice. As for their designs, every single one I have purchased has sewn out beautifully.
For supplies, also based on recommendations from the Janome forum, try allstitch.com or threadart.com.
I also bought the Embroiderer's Friend, it's a hooping aid, makes it much easier to get your hooping frame straight and where you want it.
http://www.allstitch.net/product/embroiderers-friend-hooping-board-adult-hooping-system-1477.cfmHave fun, you'll really enjoy it