First off I would suggest reading the instr. manual and try to do what it is explaining, as you finish each section.
I am very new too, I just got my GPSr about a month ago.
A couple of basics that I was overlooking was that the GPSr needs a pretty good view of the sky and that you have to be in motion for it to start guiding you in a direction.
As far as entering locations, if it is like my Cobra (also a no frills model) you "page" through to the "waypoint " screen and enter a new waypoint.Once you have a waypoint entered you can "goto" from the same screen.
I have only found a few caches so far and learn something new each time I go.
Wish you the best of luck and hope you have fun.