monk ratios, primary and offhand choices

[deadeyedick]

I am currently a level 16 human monk I have researched a bit about these questions and having trouble finding answers to these questions there seems to be some debate.

what is the math to understand a weapons delay to damage ratio?

what type of weapon is best in the main hand ?

1. a higher delay higher damage?
2. lower delay lower damage?

what type of weapon is best in the off hand ?

1. a higher delay higher damage?
2. lower delay lower damage?

when does this change to 2hb and then back to 1hb?

thanks