Sump/Funge Mayhem

[Pro Fish Keeper]

IMO sump's and fuge's are one of the biggest headachs attached to the aquarium hobby. Im told the benifits outweigh the problem(or so im hoping ). Im trying to find the best way to install a sump/fuge useing an overflow(because my tank is not drilled and most glass stores will not warrenty a cut that is so risky). Canreef as been my #1 source of info. Most of it was right on(im not going to say what happended with the other info ). I was wondering what type of flow rate I need and any good links to show a overflow system in it;s prime. Thank you in advance for any information.