The help files for ArcPad are located ArcPad Help There are many sections in the help that might get you what you need, but you may want to try ArcPad - Using existing Data
As for the Trimble units, I have no specific help there, but searching online might give some pointers if you are having issues connecting and/or transferring data over to it.
I've always been on the collection side of points and data in ArcPad, not so much on using existing data, so I can't be of more help. Others might jump in, but digging thru the help and then specifying at what point you are getting stuck, that might help.