I would recommend the Langheld-Variation of the From´s Gambit.
Wat do you play against 1f4?

After 1.f4 e5 2.e4 White has transposed to the King's Gambit, which is certainly acceptable to Black, but he needs to be booked-up.

It's called From's Gambit, if your opponent doesn't know about it but you do, you can score quick wins. Look it up.
I had a few games recently in which white played 1f4 (bird's opening. I found it difficulty to come up with something and lost. So I did some looking up and think I might play From's gambit.
1f4 e5