ski length, pole length, boot fit

Hi,

I've never x-country skied before, but I would like to get out for some
exercise as an alternative to running in the winter. I'm 6'4'', 225 lbs.
How long should my skis be? How long should poles be? And, most
importantly, how should a boot fit? Toes touching the front? Or, just fit
them like I would a running shoe with plenty of room for my toes. I
searched google for about an hour, and I couldn't come up with a whole lot
of information.

I will probably be skiing alone most of the time, so I imagine I need to
stay on busy trails with groomed tracks near roads or something like that.

Any advice appreciated.

Thanks.