Welcome Sunshine! I'm glad you joined but even happier you are jumping in. Hope you stick around.
I was raised so far back in the sticks in East Tennessee that people used to say we had to pump sunshine in. Not true but we may have pumped a lot of moonshine out.
You are likely to get some conflicting advice here. We all tend to do things a little differently but different things work. I'm in the camp that does not pinch things back unless I have a reason. For example, if my indeterminant tomato starts get too large I have been known to pinch them back to just above the first true leaf. They will sucker out and keep growing. One thing I regularly trim back is my sweet potato starts, they get so long I don't wan to transplant them that big plus I stick the trimmings in water and root them, giving me even more slips. But pinching back starts to cause them to sucker and branch out, no, I don't do that.
One potential risk of having the starting soil too moist is "damping off". That's where a fungus grows pretty much at the soil surface and rots the plant stem, causing it to turn black and shrivel, killing the plant. That's a big reason starting mix is normally sterilized, to try to keep those spores away, but they can blow in from outside. I've lost seedlings from that before. If you can water from the bottom (
@digitS' has talked about his method before) and you can keep the top of the soil dry you really cut back on this risk. I have a small fan I blow on the plants to help dry the soil surface. I understand your concern about them drying out but too much moisture can keep the roots form breathing and cause the starts to drown too. There might be a bit of a learning curve here.
One trick I use to keep my starts from getting leggy is to hang sheets of white paper on the sides to reflect light back in on the plants. It made a big difference on mine.
Again welcome. I think you are going to fit right in.