Looking to get rims 2001 ML430 W163

I am looking into getting a nice set of sporty, yet practical 20 inch rims.

The bolt pattern is a 5 bolt. (not sure of the corresponding sizing though)

What offset should I be looking for?

And from what i've heard, under 10 inch width is ideal for not being outside the fenders.

And finally, are there any tires you experienced ML'ers would recommend checking out, assuming they are economically priced.

I appreciate the help, I am rather inexperienced in terms of rims/tires.