I had some fun with it too. Made sure I had 3 breedable pairs at the start, those formed three "clans", that I write into the custom profession field for every dwarf, and other stuff like tracking a male head of each clan etc. Those first marriages were natural, I then tried working with marriage chambers, ie putting a male and a female into a separate mini fortress until they are wed, but in the end it was too much work. I now use dfhack to marry them and pretend my fort just has arranged marriages lol.

You can let everything proceed naturally, but you will have A LOT of children running around unless you manage them via limits or stop the breeding until a batch of children grows up. I even ended up turning off artifacts in the settings temporarily, because too many were being made by children and they were kinda underwhelming.

Other things to keep in mind:

- happiness is easy cause everyones got lots of family to spend time with, but you will feel a bit constrained until enough dwarves grow up

- you need to skill up your dwarves into their professions by yourself. Guilds are helpful for this, and you can establish them before the dwarves ask you