Hi Sasup,
I was in the same position for quite a few years. Once I worked out how to use the damn thing I was stumped at what to look for and most things always look different in the sky than they do in books (maps etc). This may sound really naive, but I slowly started to look at different things via gradual progression. By that I mean, I spent my time looking at the moon and planets like most newbies do, then I would pick a constellation and get to know that really well. After that I would pick something new from the star charts and move on.
I purchased all the 'guide to the sky' books, but found that with limited time its best to gradually 'star jump' rather than learning all there is at once. This works for me and by all means I go back to those books on the regular, but I found a piecemeal approach was initially easier for me to get around the sky.
Monthly star charts generally tell you whats good for that time of year, which are a great help and saves a lot of time. As for learning how to use the scope, if you dont have time to join a club (like myself), bite the bullet and go to your nearest astro shop, purchase something really small and ask a HEAP of questions
You'll feel like a fool asking fundamental questions in front of someone who knows their stuff (I know I did), but you'll walk out with a heap of ideas for trouble-shooting.
Hope that helps.
Cheers,
Greg
