Sick baby with no insurance. I have some questions for experienced moms!!?

My son is 9 months old and just came down with his first cold. He has never been sick before, so I am a little lost on how to make him more comfortable. So far, it seems like it is just a cold ( I feel crappy also). His temp is 100.2, so I gave him some infant Tylenol. I've been trying to keep fluids in him as well. Thing is, I don't know what I should have him dressed in. I don't want to dress him to warm and raise the fever, but I don't want to under dress him and make his cold worse. Its about 73 outside and I have one window open. His room is 2 rooms away from the open window. I have him in a t shirt and socks with a little blanket on him. Is that enough, or to much? I have a humidifier, but I don't know if I need it because he is not congested. Should I use it? If yes, do I use hot or cold water. Just some general tips would be great. I tried bringing him to the dr. But I just moved to a tiny town and his Medicaid won't be effective until Oct. 1st. Medicaid told me the only option I have right now is the ER because his HMO is not available yet. If it gets bad, I will take him to the ER. I just don't want him around all those sick people for something small like a cold. Thanks!