2nd question is about my wallet for namecoins. i did some command line and got my namecoin address but thats all i have. so if i lose that address, i loose all my namecoins?
If you wipe your wallet.dat, then you lose them all, but you aren't going to lose your namecoins. At any time in the future, you can start namecoind in one window, let it sync (this can take a while if you haven't run namecoind for a while), and then in another command prompt do
namecoind getinfo
and you'll see your coins. You can get that address again with
namecoind listreceivedbyaddress