Well I think I fall in the 1/2 type A . I will start working on that spread sheet now. What kinda of formula are you using? time spent at auction/loading + gas + cost at flea market + misc. advertisement cost (ebay). Oh crap I think I just moved up to Full Type A. : ).
Start with a blank spreadsheet.
In cell A1....name of facility bought, date and cost.
Start columns for item name, desired sell price, sell price. Have total at bottom of those columns.
Develop forumulas (do research on those....return on invesment, etc). I didn't know these myself until I researched them.
Then, the next time you make a lkr buy, go to the next sheet to the right and do a sheet for it. (you could copy the first one to the 2nd and then edit the 2nd for appropriate content).
Make a separate sheet (in the same book) that will have two basic areas...expenses (lkr buys, etc) and income.
In the income sheet make a column that has monthly totals that draw from the cells showing your flea market and other incomes (indiviual clist sales, etc.)
After you have two or three sheets, make a sheet (in that same book) for the yearly totals.
Develop columns and lines for each year (this year, next year, etc).
Develop rows for each month.
I know this sounds complicated, but if you know Excel and know what you want to achieve, you will figure it out.
Nothing worth doing is going to be super easy, and I never just "hand" answers to anyone who asks (thanks for not asking me to send you a template). I have always believed that "doing it yourself" is a better experience than having something delivered on a silver platter.
Hope this at least gets you interested enough to give it a shot.