Hi Stevan,
Welcome to IceInSpace
That 10" DOB is a great scope, I previously had a 10" Skywatcher which is made by the same people.
Yes you will be able to see "nebulae, double stars and star clusters etc ".
You will even be able to see some Galaxies with that scope.
Although some of these objects will be faint fuzzies, you will still get to see them with your own eyes.
The trick is to learn your way around the sky and be able to use sky charts to star hop to the fainter objects.
Certainly they will not appear to the eye like the astrophotographs on this site, which come from (upto) hours of long exposure, but on planets for example, you will clearly see rings of Saturn, and the coloured bands of Jupiter (assuming reasonable dark skies and seeing conditions).
Hope this helps,
Good Viewing