Since reading man pages when your new is a quick way to turn someone off from linux, I'll try to be a little more helpful.
Adding this to your fstab will mount it on boot.
Code:
/dev/hdb1 /mnt/fat vfat users,defaults,umask=000 0 0
The umask=000 is required if you want rw on this drive since fat32 does not have file permissions. This just assigns the permissions to the device itself. You can also mount it somewhere other then /mnt/fat but it is the linux standard to mount everything in the /mnt directory. Just make sure the folder is owned by the particular user you want to use it, or the group 'users' if you want all users to be able to access it.
Once you get a little more familure with linux, the man pages can be very helpfull.
Hope this helps,
...drkstr