You can add everything to the whipping cream right at the get go if you like. I just tend to like to whip mine then add more stuff. But it's okay to add it all in first in one step. Just remember to start out really slow on speed or you'll end up with cream and red food colouring all over your kitchen.
You can switch out lots of different flavours in this dish. I've done it with coconut too and it's amazing.
You can also do this as a full on cake or in small jars. I'll have links in the post to other posts of mine that are variations of this recipe.