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.
50-550 usd
50-500 usd
The Standard Catalog of Smith and Wesson, 3rd edition, by Supica and Nahas.
20-360 usd
100-1000 USD
1942-45. Probably 38 special
100-1000 or so depending on the specifics
No such weapon made by S&W
100-400 or so
You might have better luck asking at smith-wessonforum.com