Whenever I wanted to say that I was doing something for the first time i would say something like " kyou wa boku eiga o miru koto no hajimete desu" or something like that (that sentence is correct right?) but then beginner lesson 68 introduces a new way to say "first time" with the structure ~hatsu no ~.
So, my question is whats the difference between saying something like what i said above compared with something like "kyou wa hatsu no eiga o miru koto desu"?
Thanks in advance!