I went through a phase where I collected vintage flatware. Sadly, silverplate as a precious metal has little value. The value is in the beauty of the piece.
A good starting point is E-Bay. You can search for your pattern, and get a feel for what others have paid. I have purchased many pieces from E-Bay. If you choose to sell on E-Bay, be careful of shipping charges. I assume your set is fairly heavy.
Another possibility is Replacements.com. If your set is desirable, they will buy it.
You could check into consignment at an antique shop, but they will take a bite out of the sale.
Good luck!
ETA: After a little research, there are several Tudor patterns. This link should help:
How to Identify Oneida Tudor Silver Plate Patterns | Our Pastimes