First, congratulation for the first birthday of your daughter.
I think you are planning the birthday party first time, that's why you sound very excited.
You can choose the cake as per your taste(Because your daughter is small)like - chocolate, vanilla, pineapple, strawberry, and butterscotch.
I would suggest strawberry cake for your daughter birthday.
Choose a pink dress for your daughter matching with strawberry cake.
Children like snacks very much, so include wide variety of snacks in the party menu for the kids. Spring rolls, chips, mini-pizza, noodles, and momoes are some examples of snacks item which can be included in the birthday party.
Other than the food, you can plan some games for the kids to enjoy the party like- musical chair, pass the parcel etc.
One more thing I want to add here, try to avoid the ritual of blasting the balloon with toffees before cutting the cake, because the loud sound of blasting may scared your daughter.
I want to share one of my experience of attending the birthday party of a one years old girl child, as soon as the balloon was blasted with toffees, the child scared and starts crying non stop, no body was there to cut the cake all the party mess up afterward. So be careful about the child.
I hope you will arrange a good birthday party.
Congratulation once again.