Personal preference is the biggest factor.
A vague question that is hard to answer. Does it have the original box, manual and other papers? Any accessories? You can date it by going to http://www.browning.com/customerservice/dategun/index.asp Do a Google search to find a value and check the auction sites. Broad range of 300-600.
No such model made by Browning.
A Browning A-500g shotgun in excellent condition is worth about 900 dollars.
Impossible to answer without a detailed description of the Browning you are referring to.
A browning 351MN0117 rifle costs between $500 and $1000.
No such weapon made by Browning.
What is an A-5 light 20 Belgium Browning made in 1961 worth
This was made by Stevens, not Browning. worth about $100-150
500 USD
Browning has sn data on their website.
10-1000 USD depending on specifics.