Welcome to the world of large format! You have wisely purchased a good starter setup.
Once you have a feel for the format with one lens, you'll know what others you'll want. The typical setup is a 90mm, 150mm, 210mm, which I used for years before stumbling across some good deals on other focal lengths. Some prefer a 90mm, 135mm, 180mm, some prefer Chevys over Fords. My 210mm and 150mm lenses are my most-used focal lengths.
As others have said, your next most important purchase will be film, followed by processing chemicals, paper, etc.
Peter gomena