i would recommend starting out with just 2 or 3 brushes at first, sometimes using all the brushes right when you start can get overwhelming. my most commonly used brushes are the clay tubes, medium polish, move, and the dam_standard.
also i would suggest you focus on getting down correct proportions and silhouette before moving up in subdivision levels. bascially, use as little geometry as possible until you physically can't include the detail you want to include
edit: oh and please, please, PLEASE use a different material. the default red wax material is terrible in my opinion, and it accentuates the facets in lower quality meshes. try out a few of the others the next time you open up zbrush, and get in the habit of checking your model in perspective from time to time (i find this helps, even if you dont like to sculpt in it)
Yeah, to reiterate, stay in a lower subdivision level. The absolute first step is to define volume and do it properly. You need to get down form before continuing to learn anything else.
What is your reference material? It would help to include that so we can gauge where to give constructive feedback.
If you are a new zbrush user looking to do character work, I highly recommend Zack Petroc's DVD's from Gnomon. They are dated back to the late ZB2 days, but they still hold true and you will learn a ton, not only about anatomy, but also about a good ZBrush sculpting work flow.
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also i would suggest you focus on getting down correct proportions and silhouette before moving up in subdivision levels. bascially, use as little geometry as possible until you physically can't include the detail you want to include
edit: oh and please, please, PLEASE use a different material. the default red wax material is terrible in my opinion, and it accentuates the facets in lower quality meshes. try out a few of the others the next time you open up zbrush, and get in the habit of checking your model in perspective from time to time (i find this helps, even if you dont like to sculpt in it)
double edit: oh, and if your not, use reference
What is your reference material? It would help to include that so we can gauge where to give constructive feedback.