I am about to begin a new project which will target an existing database with some existing tables with data. As part of my project, i will create some new tables and make relation ships with the existing tables ? Which approach is better in this scenario. I believe code first will be a problem because i don't want to loose my data every time when i make a change to the table structure (for my new table).
What is the best approach to create new tables in existing db with data?
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Model-first would be the easier solution. You would just create a model from the database and then you will update the database from the model after adding new entities.
You can achieve the same result with code-first too, but with a little extra work. You will need to use EF Migrations to add the new tables to your database. You can read more about EF Migrations here and here.