Where I live most people use one deep as a brood chamber. However, they don't use this forum to see how people from around the world do things
If you don't want swarming, one thing you don't want a conjested brood nest. That means using more than one deep for brood. If you use one deep for brood you will have to use a honey....oops sorry...queen exluder as well.
People where Iive like to move brood frames up above the queen excluder to stop that conjestion, but you won't be able to do that if you are using different size boxes.
The other thing I can suggest is having two hives. You will learn more by comparing their progress and figuring out why one is going better, and if you have problems with one you might be able to use some of the strength of the stronger colony to save it.
That's all I can really think of since Michael answered everything quite thoroughly. Just read read read. Read whatever books you can get your hands on (the beekeeping for dummies is an excellent start), and read everything you need to here to fill in the gaps!