Hi -
The standard way of setting up a db in MS SQL is to crate a new DB - Call it "Dennis" or "Water" or "Breakfast" - IOW, whatever you want. Then put all your tables in that DB. Master is saved for system stuff.
SQL instances (you have an "instance" of MS SQL on your machine) are different from the embedded DB in that you can have any number (within reason) of different DBs in them. So - the Dennis system could connect to the Dennis DB & Hyannis could connect to the Hyannis DB, PTown to the PTown DB, etc. Each DB has its own table structure (though the structure in Dennis might be the same as PTown - just different data) and changes made in one will not change anything in the other.