I don't know which gear to equip

I've been playing Marvel Heroes for a few days, and a thing that is stressing me out is which gear I should equip. I go through Midtown killing monsters, and lots of gear drops. My inventory gets full of various gear, and it really overwhelms me trying to choose which gear I should equip. Each gear gives out different stats and looking through each and every gear, trying to figure out which one to equip, every time I pick one up off the ground, is stressing lmao.
So is there certain gear I should be looking for? Certain stats? Gears to ignore? How often should I equip new gear?
All of this is overwhelming. Any help would be great.
I am currently playing as Doctor Doom.
Thank you.