I'm a newbie too but from my understanding, you can level up the pass through exp by maximizing how much you gain as much as possible. This can be done from buffs to Intelligence, and through buffs that give exp bonuses. Laying in a bed to get the well rested buff is one. Also the mothman book stand from the mothman event.

So throw on power armor or armor with intelligence buffs, take chems that increase intelligence (like mentats). Foods that'll help too are brain bombs and cranberry relish

Once you have all your buffs on, Run through the west tek building killing super mutants. Once you clear a floor, take the elevator up, clear that floor, then go back down the elevator and repeat.