I got a Celestron Specialty Series Travel Scope 70mm which came with 10mm (40x) and 20mm (20x) eyepieces. 

Specifications: 

* Focal ratio: f/5.71
* Optical Design: Refractor
* Aperture (mm): 70 mm
* Focal length: 400 mm
* Finderscope: 5x24
* Highest Useful Magnification: 165x
* Lowest Useful Magnification: 10x
* Resolution (Rayleigh): 1.99 arc seconds
* Resolution (Dawes): 1.66 arc seconds
* Light Gathering Power (Compared to human eye): 100x
* Optical Coatings: Fully Coated

I’m looking for the best possible magnifications and combinations that would lemme look at planets and deep sky objects more clearly.

I'll soon be moving to a town-city area (Needham, MA) if that is of concern for location.

Can someone recommend the eyepieces/accessories/etc. I could buy? Any other opinions?

Thanks