If you want to get used to your rig, ya might want to head to Hungry Valley. They have a rather benign Jeep park there. Benign now, first time there I about crapped my pants with the things people had me doing in my Jeep. Climbing stairs, boulders, up on two wheels, freakin insane people...
The good thing about Rowher, there are normally people there doing the same thing you are, new and seasoned a like. Great place to meet people.
5 dollar entry fee to use the park. If you like to camp, you can do that there too. Hungry Valley is up the 5...
Hungry Valley SVRA
Or you could do Rowher... no jeep park with obstacles to practice, basically a fire road that in some places will get your heart beating..
Rowher Flat OHV Area - Dirtopia, the Off-Road Encyclopedia
Rowher is just North Of Santa Clarita.