A bleg

The number of submission I have at the same time hsa been rising lately and I need a good way to keep track of all of them.
A friend once suggested a database where I could track submission, sale status, payout and when and even re-sales and payouts there.
Being as clueless as an Eskimo with a Camel I need assistance and trying to find a database suitable for my needs.
I run all my stuff on an Apple running OS 10.5 and it should be a really simple prgram as I can not afford to pay pro-rate for DB design.

Any suggestions?