Samsung MM-A900 / SPH-A900 / Ace

I began with a Razr, and returned it. However a couple of Razr features, I cant figure out on the Blade if they exist (trust me, I have read my owners manual

1. I cant figure out how to set my phone to auto answer when I flip the lid open. currently, I have to flip, then press a key. I want it to answer the incoming call just by opening phone.

2. The razr allowed you to assign whatever feature you wanted to the soft keys, on the main menu. On the Blade, am I confined to "contacts" and "favorites"?

3. now for the kicker, and forgive me if this has been covered.....if so, I'll research more.
My phone came with a cord to hook to my computer. how do I d/l one of my mp3 files I already have, and then make it my ringer?

4. should I really let my battery discharge?? I read some places that this will help future battery performance, then I read other places that this is a no-no. I bought a car charger AND and extra wall charger for work ($7.44 and $14 at Walmart, btw) so Im mainly concerned about how to improve life for times my phone will be in my purse for 8-10 hours w/o charge.

Im sure I'll have more questions once I get past this basic stuff, but thanks for your help in the meantime!