Powerhead question

[fido19]

hey guys i took the plunge into saltwater about a year and a half ago and i must say it is a hobby i really enjoy, the forums have been really helpful with a lot of info.
i have one question to ask and that is how do you guys place powerheads, idont have anything fancy yet but i am considering getiing a vortech or a tunze but for the time being is there any way you guys recommend placing powerheads in such a way that i have areas of high flow and low flow.
i am getting my tank aquascaped soon(i know i dont have the artistic ability) is there anything you veterans recommend that i should do in particular

i appreciate any info and this is my first time being in a forum so if i break any rules i apologise