It's not possible to answer the question as asked. There are too many types, models and variations of these guns to consider. These guns can sell for as little as a hundred dollars up to thousands, depending on what it is, when it was made and condition. Condition is everything when appraising a gun. As always, it's recommended that you have it appraised at a Gun Shop or qualified professional.
20-60 USD or so
The Marlin 3030 model is a classic hunting rifle made in 1902. The value of this gun today can reach several thousand dollars.
3030
plenty
200
want ad, gun show, gun shop
50-200
Your gun is a 1964, you can run the serial # here: http://www.savage99.com/winchester1894_dates.htm Maybe $800.....
Tea set
I think your best bet to get a value on this would be to contact (or if you live near one take it there) a Bass Pro Shop fine gun room.
100-1000 USD or so
Tea set