Question updating my s3

i have the teamwin recovery on my s3 however i wanna get slim kat

i also noticed that my baseband and modem are not up to date so i wanna update those as well

can i update the firmware and modem with odin?
can i use clockwork mod from the play store to instal the firmware and modem ?
last .. is there a specific order i should install these things>?

thanks friends
may the force be with you