Incredibly easy! Most herbs are hardy plants that can tolerate a fair amount of abuse... mind you, they don't like the cold.
I had mine in a tank with grow flouros on top of them. No particular timing is required... I would turn them on when I woke up and turn them off when I went to bed.
I'd recommend starting from seed rather than purchasing a plant from a garden centre. Plants can be hard to track down, and will cost the same as a package of seeds... but the seeds will you keep you going a lot longer!
What were you thinking of growing?? Then I can provide more herb-specific advice