It's best to enter the main hall by a side door, instead of stepping on the threshold (the threshold is the Buddha's shoulder). If the mat for worshipping Buddha is very long, don't choose the middle one, it's for the master to worship Buddha.
Three weeks, three times is enough.
Generally, it is forbidden to burn incense in temples, some can offer incense, and some are not allowed, so it depends on the regulations of temples.
On the fifth day, when burning incense, three is enough. Don't burn too much. Don't blow with your mouth when the fire is big. Fan or shake it out with your hand.
The worship order of the six halls is first in the middle, then around, and worship clockwise. Generally, after worshipping the side points in the main hall, you don't have to worship them one by one, just salute with your hands folded. That's basically it.