Hi Michelle (and bob)
That 10" scope should give you many years of happy viewing. There are an enormous amount of targets within reach of a 10" scope under good skies, which you obviously have. A couple of lifetimes of objects to be exact. For starters you should be able to get just about every target bar a handfull that are listed in my 600 target observing list in a 10" scope.
http://www.iceinspace.com.au/63-638-0-0-1-0.html
A couple of things to take on board.
To see really faint targets and extract intricate detail from them is a practised skill. You will find you get better and better at it as time goes on. Targets which now appear to you as featureless grey balls will in time reveal a lot more detail and structure. In addition it is importnat to have good dark adaption. It takes at least 30 minutes to become fully dark adapted. Leave the dimmest targets until you are properly dark adapted. By the same taken don't go from a retina burner like Jupiter straight to a 15th magnitude galaxy and expect to see much detail in it. It will take time to regain your dark adaption after looking at really bright targets.
Don't be scared to use your higher power eyepieces. While the object itself gets dimmer as your increase the power, it also improves contrast. This is the critical thing when observing dim objects "contrast".
Stick with the eyepieces you have for a couple of months. Then consider upgrading to a couple of better ones. Premium eyepieces have much better light throughput and "contrast" than the generic eyepieces supplied with the scope.
Further down the track consider a filter like the DGM Optics NPB filter.
Cheers,
John B
were not visible at all. It was also quite "large" in the eyepeice, and not as tiny as I expected it to be. As it was very, very faint in the deep view EP I didn't put the 12.5mm EP in. 
