what does "address" in the wallet mean? does the wallet generate new addresses??? Is it my new bytecoin address?? Is it the one i should use?

Yes, when the first opening the wallet generates a new address for the user
Once you open Bytecoin Wallet, it will automatically create your first Bytecoin address and start synchronizing with the network.
If you don't need that, just open the wallet that you used before. You've gotta go File - Open wallet, then find it and hit the button and you're done.
Btw if you're gonna come around and and use the automatically generated address, then you better encrypt it: go Settings - Encrypt wallet and create a password (complex one!).
I think that guides are required in any case. Will it be available on bytecoiner.org?
The wallet is nice, the interface is intuitive. But for a user new to Bitcoin and CryptoNote coins it may be difficult to figure out what's going on.
A video may be even a better idea.