Hi steve,
I would also advise to go for braid, but mono in my opinion will be easier to learn to cast with. The main thing is to find your comfort zone with the reels. Take them both to a field and practice casting, start with a small weight and build up. You will also notice that you will find a weight that just feels easier to cast, each rod has there sweet spot when it comes to the weight. But as you get better you will be able to cast all weights with ease. Like the guys have said, start with small throws, this will also help you adjust to how much pressure you need to apply to the spool with your thumb to stop the crows nest biting you. Increase the distance and power of the cast as you get comfortable with it. You are going to crows nest, this is a given, you are also going to burn the hell out of your thumb a couple times when you first start, ive been casting with these reels for years and still burn the skin off from time to time. Wet the spool a bit when you cast, helps to stop the burn.
As has been said the star by the crank handle is your drag adjustment, i love the drag adjustment on these reel and is one of the reason i advised you to go for them. It is a fast adjustment and one you will get the feel of very quickly. I prefer the drag over the penn's becasuse of the smoothness in adjusting and the chances of you under or over doing it during a fight are slim once you get to know it. The little lever that almost hangs over the spool is the disengage. When you want to cast you flick it down, disengages the gear from the spool, will spin freely. I keep my reel in free spool after i have set baits and just leave the rachete on. The rachete, excuse spelling, is on the silver button on the opposite side of the reel. If you have your reel in free spool and click this on, there will be enough tension to not let the line crows nest when a cat takes, but outs very little pressure on the fish when it bites. Also you will hear the rachete from a mile off when the fish takes the bait.
Just one thing to remember, when you are reeling in you have to guide the line with your thumb and make it even on the spool, can take some getting used to but becomes second nature very quickly and you dont even think about it after awhile. You have bought some of the best barbel reels around and im sure your first monster will come from them.