You'll want your kitten to become a cat that relates well to people and is a friend and companion. To achieve this, you need to bear in mind that cats have a very short socialisation phase. So the first four to 16 weeks of life are a critical time for behavioural and social development.
Before your kitten comes to live with you, she will have been interacting with her mother, her littermates and probably several different people.
Be wary of choosing a kitten that has had little human contact, such as a kitten that has been raised in a shed or pen far from the house. Kittens need to get used to being handled by people very early on, preferably by several people so they don't just learn to accept a single caregiver. They also need to become accustomed to the sights, smells and sounds of everyday life.
Your kitten will probably move into your home when she's about eight to 12 weeks of age. Assuming she's already had lots of human contact, it shouldn't be too difficult for you to reinforce all the good work and help her grow into a friendly, happy, confident cat.
When your kitten first arrives home with you, remember it can all be a bit overwhelming for her. Take her to a quiet, safe place and show her where her food and litter boxes are. Give her lots of love and reassurance and pet her gently, talking to her in a soft, calm voice. Playing is also a great way to socialize your kitten and form a bond with her early on in your relationship.