Well for the servos you probably need to import a library into the project which will make it possible to manipulate them with a simple command, I didn’t use a spark but i’m sure there’s a library readily available on their community site. The little playing around i did with the IDE it seemed very easy to add a library just by “forking” the repository.
As far as where things go, I hate the hardware aspect of arduinos and what have you, I suck at soldering. You just have to really decide which pins are capable of sending the signals you need and making your code match up with that pin. If you’re talking about where things go inside your blinds housing, I replaced the entire twisty bit with the servo, it broke nothing and popped right out so I was ok with it.
Good luck, you can PM me if you have any hardware or blinds question. Spark questions, not so much, although I’d like to have one someday.