I don't think you should be focusing on VOR nav if this is your first true cross country. Stick to Pilotage and dead rec. If you want to suppliment with a VOR cross check or two do so. VORs are easy, but they're also easy to screw up with if you're that unfamiliar with them.

My suggestion would be wait until doing a night cross country with your instructor to spend some time on VOR nav.