What are the things i need to do before installing windows 7?

What are the things i need to do before installing windows 7?

I have a windows XP2 32-bit and i want to install windows 7 but i do not know what are things i should do before installing it. its my fist time to install an OS if ever. I mean, specifically on the drivers, BIOS, and others? how will i know that the drivers are compatible to win7? how to install it on first boot? hope you can help me.