I'm so screwed haha. I took Datalanche's approach of having some fun and I bid on various items.
LOL Don't pin that on me!!
It's a good idea to not just bid aimlessly or place high initial bids because you will end up winning stuff for a high price.
I did that a few times with some Oshima Mai pictures back in '08. I put in a high bid thinking it couldn't possibly go that high. Well, IT DID.
Since you're in, you should get some good Rena items. Auctions are really cool in that you can pick up stuff you seriously can't get anywhere else.
Also one more piece of advice, keep a spreadsheet of the total costs and watch it. It will add up way quicker than you think with all the fees and stuff. Seriously, have fun but be careful!
If you need a good excel clone you should get OpenOffice, btw. It's free.