RAID 0 has no redundancy, so unless you want a performance boost, it probably wouldn't be the best for what you are doing.
There’s no redundancy for spanning either.
how do i do this? i tried googling it but i couldnt understand it
This link makes it pretty easy to figure out: http://howto.cnet.com/8301-11310_39-57378002-285/how-to-turn-old-hard-drives-into-one-large-drive-in-windows/
Again, there’s no redundancy, so if one of your drives dies then you lose all of your data; so have a backup plan.