If you have never ridden sand before, you are unfortunately going to "fall like noob", as you put it. A couple of pointers that I can offer, is to get onto the balls of your feet and stand as much as you can on , as a sand track gets rough quick. Also, brake earlier, sit earlier, and drive through the corners on the gas. Also, take flowing lines as much as possible, you need to keep your momentum up as much as you can. I think these couple of key points should really help you out.
Sand tracks can also tire you out faster, so dont over do it, and get a few motos under your belt before you have any ladies with you that you want to impress.
And .... HOLD IT ON !!!!!!!!!!!