First time with pregnant cat... Help!

my cat was in hear when she ran away two months ago, but she came back last night and she is pregnant. she is generally a shy cat but because of the pregnacy she is outgoing, but I'm only 13 and i'm kind of afraid to hold her to introduce her to the carrying case we set up for her. I also have a question about where to keep the carrying case because I have several cats so there isn't a secluded area in the house and when she was home she never went downstairs because she doesn't like the dog. My family needs help fast because we have no clue when shes due... Please help!!!

Go to your vet & have a talk about what to expect with your cat's pregnancy, what you should do, & what the cat needs in the way of regular care.
   
You need information from a professional. That's what a vet is for.
   
If you're short money, go through the Yellow Pages & see if there's a low-cost vet clinic in the area. Also, some of the veterinary colleges operate low-cost veterinary clinics, known as "teaching hospitals", where the 4th-year students learn to care for actual pets as part of their training.
   
Actually, cats mostly take care of themselves during their pregnancy, but you do need to know what to feed them and how much, & what complications to look out for. But as to having the kittens, they normally just have them when the time comes, with no help from us humans.

I re-read your post; sorry, I missed a couple of things before. (I just found this post today).
   
Definitely, take her to the vet for a checkup.
   
Kittens are born in 63 to 65 days, so she's due any day now.
   
You can lift her if you carefully support her legs & body & don't let her hang down.
   
Put the case in a quiet corner of your room; leave the door open for her. Put old towels or shredded newspaper in it, for her to use as nesting material. You can always give her a litter box & keep her in your room with the door closed, to keep her way from the other animals.
   
She'll start nesting when she's ready to have the kittens. Leave the birthing to her, it's instinct.
   
When they're born, call the vet, ask when he wants to see the whole family for a checkup.