Here are some of my tips for running a successful first group buy:
0. Get organized. Use a spreadsheet to track all info relevant to the group buy. Also post in your group buy thread who is buying what.
1. Keep the quantities low - Since you are talking about a Everdrive group buy, all you need is 10 to get the discounted price. I would suggest limiting the group buy to just a total of 10. There is an option for them with or without cart shells so keep that in mind.
2. Limit the scope of the group buy. Just offer 1 item. Different everdrives, SD cards, cables and accessories complicate things.
3. Have clearly defined goals in your group buy thread. Post specifics about what is being offered, how long it will be offered for, total number needed to make the group buy happen, shipping terms and etc. And make sure people know when they need to pay by. Don't leave these kind of details up to interpretation.
4. Keep your thread updated with the status of what you are ordering, when it arrives and etc.
5. When giving shipping quotes, take into account cost of shipping supplies. Unless you are shipping everything via Priority mail flat rate boxes, things likes padded envelopes and such cost extra.
These are just a couple quick things off the top of my head.
Really, if you limit what you are offering to a single item, limit quantities (like 10 in the everdrive case) and get organized, it's a pretty simple process. I would look through any of mjmjr25's or my group buy threads for examples.