First of all you have the "sportsman 48", "sportsman 58" and the "sportsman". If it is a plain sportsman it's value depending on it's condition is from 150 to 200 dollars.
50-350 usd
Date code stamped on left side of barrel, go to Remington Society of America for diagram and chart.
It is a St. Louis Browning made by Remington for Browning. It was made around 1940. It's value is probably around $250.00 without seeing it. The B means it is a 12 gage. A was 16 gage and C is 20 gage.
Value of 75 Cherokee 12 gage single shot
50-100 or so
Not marked, Model 9
Check this page on the Remington Society of America for a list of places: http://remingtonsociety.com/rsa/service
50-100 USD
25-100 USD
Starting in 1921 Remington date code stamped all it's firearms on the barrel. You can look up the details on location and the code table on the Remington Society of America on the Manufactured Date link.
Impossible to value with just the serial number.
No such model name in the Browning line.