Servitors are a kind of artificial spirit you make to do a certain thing.

They have many uses, including watching, following and protecting.
They can have a timer, if you wish for them to self destruct after their task, but I prefer keeping them.

Here's one method for making them:

Focus on your Core(Energy Core Store/Dan Tien).
You should than eject a stream of your astral essence from that spot to a point three or four feet in front of you. You can use a place or draw a triangle if you wish. Under the spot where the servitor is going to manifest. To accomplish the ejection, simply will it to be so. If you are a visually oriented this can be accompanied by visualizing a gray stream of astral matter leaving your body and gathering in the designated area.
You only eject a small amount of this astral essence and make the servitor small. Will the mass in front of you into a shape you find suitable.

You can now give it a task.