newbs about tubes

Hello,

I've finally saved up and set up my entry level analog system. I settled on a jolida 202a for an integrated amp. It came with tubes and sounds great. I just have a couple questions if anyone can help me out:

1. The main tubes are EL34s What are some good tubes for this amp and where can I find them.

2. I need to get better RCA cords, what are some cords (not too crazy priced)

3. I'm going to pick up a voltmeter this weekend to bias the tubes. What is this I keep hearing about "rolling" tubes, is this the same for biasing?

thanks!

david