Baking my first cake. Got a newbie question.

I took the recipe off youtube. So I didn't know what butter milk was and I put regular 3,5% milk. Also it said that you need to pre-heat the oven at 350 degrees and bake for 30-35 minutes, but my oven doesn't go past 250.
So do I bake it longer to make it good? about how long? Also is the milk going to make much of a difference?

EDIT: Holy shiiiiii.. I just realized that 350 degrees could've been Fahrenheit, not celsius x.x

I just looked, it was 176 celsius, damn