Ive registered to breed my purebred ragdoll, although she is quite a small cat..?

Hi, ive registered to breed my purebred ragdoll, although she is quite a small cat. She will be 1 in September and thats when i was looking at first getting her mated. I was wondering how many kittens she will have if shes a small cat.. and if she will have any complications during the birth because of it also? Do cats usually need assitance during birth?