No dumb questions. As someone who has a much bigger frame and a full C-note heavier, don't apologize for sharing the details. More info will get you better answers. I'm new to mountain biking also, but what I've learned is that running tubes limits your options for tire pressures. I recommend making the switch as soon as you can. So, to your question: Tubes do all the work for keeping the rim off the ground, so you have to keep your pressures up. That doesn't mean you can't adjust a little, just not as much as tubeless. I would recommend following the numbers on the side wall, then experiment with lowering your pressures a pound or two at a time. You can also talk to your LBS (local bike shop). I'm sure they can give you some quality input.