I don't know of any articles, but here are my two cents:
Really, it's an entirely personal practice. Some people cast a spell once, and only once. Others "work" the spell over a period of time.
Take a jar spell for example. Some would take the jar, make it, and then set it somewhere for it to work their spell (like a traditional witch's bottle). Then, some take the jar, after it is made, to a working altar. There, candles are burned on top or around while chanting or praying over a period of time (usually until one sees results) before being buried or placed somewhere new.
Pots or similar charms are an example of a continuous spell. Very much like a jar spell, a container of some sort is filled with items then prayed or chanted over to keep the spell going (Usually it isn't sealed). Candles are burned, items are replenished or added. Sometimes the old items are "disposed" of and replaced. It's a place to continuously draw in things such as prosperity, happiness, luck, etc.
I tend to see charms being recharged or fed after a period of time (sachets, ladders, talismans, etc).
It's really up to you. Just do some research, get creative, and do what's needed.