I am making my daguther 1st birthday cake soon. I will be using the number 1 cake pan by wilton. I would like to make the cake 2 flavors.
Any tips on how to make it 1/2 and 1/2

Well, you could fill half the pan with one flavor (using something to make a dam) and then the other half with another flavor.

OR - you could bake 2 cakes, one each flavor, cut the 1 in half (horizontally) and push the two halves together and ice. Or tort the 1's and put one flavor on top of the other.

I normally make a heavy foil "dam" have my husband hold the "dam" I add both flavors remove the foil and the merge.

This is my most requested way of making cakes. I make up my two flavors in two bowls and once both are ready to be poured in the pan, I have my husband pour one side and I do the other at the same time and pace. Bake as usual and you have your two flavors. Hope this makes sense.

I just tilt one side of the cake pan, pour in the white batter, then lay pan flat and pour in the chocolate. Swirl the two flavors slightly in the middle.

Most of my sheet cakes are done like this.