Back to basics - entry level screen printing using lith / line film
Having used darkrooms for a short while and got to grips with the standard bw processes and some colour work, I would like to try screen printing a poster or two using the traditional technique of making a halftone image using lith or line film. However, the books I have read on the subject have led to confusion, either because they were published several years ago and the equipment mentioned is no longer available, or because they assume a level of knowledge that I do not possess.
I understand that I should create a halftone image by contact printing a bw neg onto lith or line film (I have both but have never used either) and developing in high contrast developer, and use this to make each of the single colour stencils for making the screens.
I also understand that the screens are made using some sort of photographic emulsion, but the information I have read on this and each subsequent step has been scant at best.
Could anyone point me in the direction of a book or website that will spell the process out nice and simply for a dummy like myself please?
Also, if anyone has any tips for using lith / line film, for this purpose or any other, I'd be interested to hear them. I intend on making some bas-relief style images too, but there must be other uses for this steep film?
/edit I should point out that I am not looking to become heavily involved with this, nor to outlay a lot of money. Any stages that can be done on the cheap, DIY, or even done in a rough and ready fashion will suffice. This is to satisfy idle curiosity, not to produce stellar images for sale.
Thanks in advance!