Looking to learn about tax liens and deeds in Florida-Volusia in particular.

Looking for someone who can help me learn more about how tax dees and tax lien sales work.  I'm set up on the Volusia TaxDeed Real Auction site, but am struggling to understand the following:

1.  In researching past sales, why do some deeds with a face value of say $600 get bid to $1500 when moments later another deed with a face value of $3300 also bids to $1500.  I need a better understanding of the numbers. 

2.  Do you own the property if you win or are you holding a lien that pays interest.  If someone misses one tax payment, can they pay the bill with interest which would then pay the holder back and deed cleared back to owner?

3.  If you do end up owning the property, how long until you can "quit claim" it to yourself or what is the process to get the deed recorded in your name?

4.  What do I need to know that I don't know? 

Any help would be appreciated.  I'm interested in exploring this space but don't feel like I have the grasp I need to make good investments yet.