Need to know which model. S & W made a lot of 45's.
You can get manuals at the Smith and Wesson website.
You hold the slide back about half way and push out the slide retaining pin. At that point, the slide will come off the frame.
50-500 usd
50-550 usd
The Standard Catalog of Smith and Wesson, 3rd edition, by Supica and Nahas.
100-1000 USD
20-360 usd
1942-45. Probably 38 special
100-1000 or so depending on the specifics
100-400 or so
No such weapon made by S&W
You might have better luck asking at smith-wessonforum.com