Re: which painter's putty or caulk?
It might sound silly, but use painters caulk. It's a lightweight caulk designed for trim and molding work. DAP makes Alex Painters Caulk.
DAP also makes spackle for holes
There are other brands of both products out there, any should suffice. All will be available at any hardware store, big box, or building supplier.
I suffer from CDO ... Its like OCD, but in alphabetical order, LIKE IT SHOULD BE!!!