Thanks BigDog & Seven! I'll keep all that in mind.
Seven, Liberty is in the Upstate of SC near Clemson, Anderson, & Greenville, it's a small town. In the summer it's pretty humid here too.
I stopped by a music store yesterday & spoke with the owner. He siad that it's best to start out with steel strings beause they aren't placed as far apart as the nylon strings.(Kinda confusing to me bacause I thought the strings were interchangable. I didn't think to ask him that because I was a little distracted trying to keep my daughter from pulling me down as she clung to my legs.
) As far as which strings last longer, he said that really depends on how the instrument is played & cared for.