So, I’m terms of range, you’ll probably have to use the in-game fitting simulator for exact numbers, but you should be aware that your range is very dependent on ammo type/equipment. In the end, you’ll have to make a choice between: long range or high dps, or some sweet spot in the middle.
Also, I totally get that you don’t want to invest in skills you’ll end up never using, but to make the best choice- you really should try different things out. I suggest that you level the different weapon skills to level 2 or 3 (which shouldn’t take very long at all)- and test it out. If you enjoy the play style- and want to get better, only then should you skill to lvl 5. Not a big deal if you have some level 3 skills you never use since it’s not much of a loss.