I'll start.
Read the stickies...and we have a Wiki. All the information you asked about and lots and lots of discussions can be found there.
Biggest suggestion I can give right now. MAKE DAMN SURE that you are the OWNER of both accounts. If "a friend" gave you the second...or your mom...your brother...your neighbor's dog...don't box with it.
<ahem>
End of dire warning.
Now don't be lazy and go teach yourself!
Good luck!
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