Hi everyone. I've known about Bitcoin for a few months now and just recently decided to see what it was all about. I got a wallet (Multibit) and did a few surveys online for some free coins just to get started before I use my own money. I'd like a few recommendations though and a little info. Which is the best wallet to use and are they all basically the same thing? And how long does it take for Bitcoins to show up in my wallet after completing something like a survey or a buying coins myself? Also, what's the whole QR code thing in my wallet supposed to do?