Very good question, anon! I’m actually rather bad at filling up custom hoods. :3 Out of all my custom hoods, Sycamore Cove is the most complete, you could say? Even though it’s far from being full, as you can see. XD I tend to focus on one area at a time to give the illusion of having a crowded, densely populated urban hood. I’m starting to spread out into the more “suburban” areas, but I still have a long way to go before I even come close to filling the terrain. Hood deco is a LIFESAVER when it comes to making your hood look nice and full without having to actually build things. 😀 I didn’t even have to plunk down the trees – voleste included a decorated version of the neighborhood for download. 😀
As for filling it with Sims, it all depends on your play style. I like to play in rounds, so starting off with 3-5 households is usually sufficient, especially since they’ll marry off and have kids, and before you know it you’ll have a ton of active households. 🙂 I’ve also been itching to try a BaCC (although I haven’t decided what rule set to follow/how strict to be with it). But generally most BaCCs have rules for how many families you should start with and when you can start “unlocking”/building community lots, etc. It might be nice to have some sort of guidelines to follow while you’re getting your new hood off the ground instead of being like me and building 800 community lots before completing a single round of gameplay.
It will never look as good as, say, speakinginsimlish‘s stunning custom hood. But a girl can dream, eh? 😀