If you have just bought/found/received/acquired a Webcam and now want to use this camera for astro purposes and you want to know how to do that: this is the page you were looking for: WELCOME!
You should realise however that it will take you some time and efforts before you actually will be imaging: study comes first!
And er ... don't start with deep sky objects, but first go for the moon and planets: that is also very rewarding: my own images speak for themselves!
The best start is here: The QCUIAG FAQ. [alas slightly outdated ...]
This FAQ gives answers to WHAT webcam to choose, how to modify, how to make (or buy an adapter from QCUIAG member Steven Mogg) etc. etc.
Then download and study the Imaging Cookbook for Beginners [Word version - 54 Kb]
You need special imaging software, such as K3CCDTools (Version 1 freeware; version 3 at low costs), programmed and owned by QCUIAG member Peter Katreniak.
K3CCDTools also does fine in post-processing!!
QCUIAG member Carsten Arnholm wrote the K3CCDTools tutorial Deep Sky processing.
Of course you want to log the camera settings you used at capture time: I use Martin Burri's WcCtrl, which also has a screen dump facility.
Popular alignment/stacking/wavelet processing software (also free) is Registax, written and owned by QCUIAG member Cor Berrevoets.
Hint: study the Tutorials on the Registax website: valuable Help information!
And of course there is IRIS, a powerful alignment and post processing (freeware) package. Not so easy to use but once you have mastered it ... wow!
For final touch-up there is the easy to use (freeware) Irfanview or the more elaborate The Gimp (freeware).
To construct a Moon mosaic I use iMerge, written by QCUIAG member Jon Grove.
And here is the SOFTWARE I use myself, most of it is freeware.