You really should have researched this before you began breeding...
There's a good chance you do not have to do anything at all. Normally mom will take care of everything, and most likely while you are asleep.
She'll jump around when she has contractions. It looks a bit weird. She stands on her hind legs, jumps a bit, then she will look down between her legs, and jump again. You can actually see her pressing while doing her small jumps.
When the kit comes out she will eat the placenta before she washes up the kit.
If the kits come out the wrong way around, you may have to help her. The risk of this happening is very small. But then you have to pull the kits tail. There's a good chance the tail will break off, and the kit may not survive.
Depending on how good a relationship you have with mom, you can start handling the kit/kits from the moment they are born. Only a couple of minutes at the time though.
The first thing you should do when you have a dry kit is to weigh it, and keep doing this every day, for the first couple of weeks.
It's normal for the weight to stay the same, or drop a couple of grams the first couple of days. Around day 3 you should see a weight gain (1-2 grams), but if not, you need to help out, and give the kit some food. 0,1-0,2 ml a meal should do it.
As far as I know, the best thing to use is kitten milk.
The kit will be moving around a lot and be very good at jumping from day 1, so you need to be careful when holding the little one