Welcome it afn! Just saw this and thought I'd chime in, I'm still a bit of a noob too.
Limeis a must, also cal mag. My soil is always heading down on the ph scale throughout the grow which leads to cal mag defiencies which leads to crappy looking leaves. Lime in your soil mix will buffer that tendency.
Lime explainations
Also consider throwing up a plywood box, or get a grow tent, if there's a big enough closet in the room as well. I've never grown in a whole room, but it seems to me it'd be easier to control the environment if it's a small one, especially for your first grow, mainly smell issues. You,ll be blowing all that cooled air out your window for ventilation.
Did you put the paper towels in a small Tupperware? Seeds need to be warm dark, and humid. Also spring water rather than tap for the seeds. Also how wet? They should be damp not dripping. I killed 10 seeds my first try.