tip 11; In the beginning dont be an enemy of the North side player. A temporary alliance can yield good results even. Anyway it is often unwise to help west and east attack north. When you are left with north defeated and east and west attacking both on your flanks, you have a problem.
This is not a rule set in stone though, just something to keep in mind, and understanding this might benefit you.
I don't agree with 06. It's quite the opposite. Most of the time it is unnecessary and should be avoided, because it weakens you compared to the other players and it may weaken you more than your opponent (so arguably it's worse than an equal piece trade). The one with the extra queen(s) usually becomes a target and most of the time you can just take advantage of someone else's attack or threat to snatch a queen for free or you can give someone else the opportunity to grab a queen (and sacrifice a piece for it if they want to). Don't sacrifice your own pieces if you don't have to. It will only make the other two players happy.