The word "solicit" means to ask for or request. If the publisher requested that you send it, it's solicited. If you just send it, it's unsolicited.
google is your firend..
Manuscripts. Use paper described as "Bright White" in color and at least a 20 lb. weight.
The manuscript had to be completed by Friday
I think it would be cursive because manuscript is when you type in print so the only other way of writing would be cursive.