ASP Custom Storage Provider [on hold]

I'm trying to make my own Storage Provider for my Products

I would like to do the following in my seeding (for example)

var store = new ProductStore<Product>(_db);
var manager = new ProductManager<Product>(store);

if (!_db.Products.Any(r => r.Title == "product title")){
    var product = new Product {
        Title = "product title",
        Description = "product description"
    };

    manager.Create(product);
}

Any examples or Links to tutorial, so I can understand what needs to be added, and why. Would help me so much!