Moving from PNS to a DSLR usually starts with a big step backwards. It's normal for photos to not turn out as you expect/want and can leave you frustrated. I know I was frustrated sometimes I still am. Take your time, read more and as other say, use auto mode and see what the camera does. From there, try using the various other settings, like landscape and portrait for those scenarios and see what the camera sets the values at. From there move to P, AV and TV. Stick with it, and you'll be able to see the improvements in your shots!