Congratulations that you're getting married to the guy you love!
While choosing a wedding cake for your wedding function, you need to keep the following things into consideration:
1) Obviously the prior most thing is the size of the cake. The size of the cake should depend upon the length of your guest list.
2) What you like matters but when it comes to wedding cake, choose a flavour that is commonly liked. In short, avoid experimenting while choosing your wedding cake flavour.
3) Decoration is important. Your wedding cake should look as lovely as both of you together.
4) Schedule the delivery of the cake closer to the time it's to be served. It's important for the freshness of the cake.
Here's a blog that might be helpful for you to pick a cake design from: