Yes first real tele. bought it for planet viewing and learning the night sky. I hear with right eye pieces and good dark areas Dark sky definitely helps, what you can see from a light polluted location will look better, and what you can't see will be visible.
a few galaxies and nebula can be viewed but are faint and fuzzy dots. With a 10" telescope a lot more than "a few" galaxies and nebulae will be visible. Do an internet search for "Messier objects" or "Messier list". That will provide you with 110 objects of all the basic types to look for: galaxies, open clusters, globular clusters, nebulae, planetary nebulae. Another thought is to get a cell phone app like Sky Safari which will help you locate these objects in the sky so you can look at them.
I wanted a good size dob. 10" is an excellent size for a scope. Big enough it allows you to see LOTS of stuff, but not so big you can't transport it to dark sky or grumble about having to set it up at home to view.
but wasn't Shure about spending 700+ for first scope Completely understandable. If you decide you don't like astronomy, you'll be able to sell that scope pretty easily. With the deal you got you might even have a future as an astronomy equipment broker. If you do like astronomy, consider what Jon Isaacs said above. Many would consider a 10" scope a "life time" scope, so you could modify and improve what you have over time. As you can see from Jon Isaacs' photos he has hardly anything left of his original scope, but he made the changes over time, so the cost at each step was fairly small.
so I don't have a problem spending some money on a few good eye pieces. Like women and shoes, we astronomers can never have too many eye pieces.
just wondering about diam. and size . Typical modern eye pieces come with 1-1/4" diameter and 2" diameter barrels. You're starting to delve into the depths of eye piece discussions... Perhaps cruise around the eye piece forum and read some old threads. I think, to keep the information dump limited and focused, the other thing you'll be learning about soon is "apparent field of view, AFOV" and "true field of view, TFOV". These are descriptions of the size of the piece of sky you can see through your telescope, and they are related. When somebody, like Jon Isaacs or lakland5, talk about a "60 degree eye piece" or "the Explore Scientific 68", they are describing eye piece designs with a 60o and 68o apparent fields of view, respectively. More AFOV costs more money (generally).
what 2in or regular size pieces should be good choices. I still recommend you take it slowly with eye pieces. There will always be eye pieces to buy, so you don't have to rush. Rushing will result in your buying eye pieces you don't like. Not that there's anything wrong with that, it all adds to experience. But taking it slow will maximize your experience and minimize the money you spend.
I was told not to buy the eye piece kits like celsetron sells because I wont use all of them.? I generally agree with this...
what size 2x Barlow would be good a 2in or regular size. or will a 3x Barlow work A Barlow will work with your scope. A Barlow extends the focal length of your telescope, to the effect that an eye piece used with a Barlow gives more magnification that that same eye piece by itself. One reason to use a Barlow is to make one or more eye pieces provide two different magnifications. For example, that 17mm eye piece you have gives 74x in your scope. If you use it with a 2x Barlow, it will give 148x. Another reason to use a Barlow is you can use longer focal length eye pieces, which generally have more eye relief (I'll leave it to you to look that one up) and get higher magnification while still having long eye relief. Barlows can also make the view around the outer edge of some eye pieces look sharper. All that aside, I still don't use Barlows, but that's me. Again, I'll recommend low, medium and high power eye pieces to start (so really, only two more than the 17mm you have) and then collect more later.