backup strategy

hello dears

i have installed symantec backup.exec 2010 r3. Now im ready to schedule a backup strategy for my virtual infrastucture.

but im a little bit confuse how to organize tape in to tape library and then how to configure tape library with append and overwrite.

Actually i have ten tapes and i want to use both for full and differinicial backup.

could you please suggest anything what to do in that case ?

thanks