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You should type "man lvm" and read it. It will tell you all the other commands that are used for Logical Volume Manager at the end.
Generally the steps are:
pvcreate = Prepare a disk or partition for LVM (makes the PVs).
vgcreate = Create a Volume Group (VG) - In this step you select which PVs to include. A VG can be thought of as a logical disk.
lvcreate = Create Logical Volumes (LVs) from the VG. These can be thought of sort of like logical partition of the logical disk.
Once you've made the LVs you have to layout a filesystem on them (e.g. with mk2efs for ext2 and ext3 filesystems). You then mount them with the mount command.
You can type "man" for any of the commands I listed above including mk2efs and mount.