Control Your Losses

have just got back into magic, after selling my collection in 04. after almost nine years im a bit rusty, and this is my first attempt at building my own deck since returning. i was largely a control combo player back then, and plan to return to it now. with the release of gatecrash, i intend to largely play dimir, its meant to be a standard legal control mill deck. any suggestions are more than welcome. im most unsure about the sideboard, i remember aggro being the largest problem for me as a control player, and i imagine it still is. not huge on what the meta is, or expected to be. should i run more less creature control in the main deck, do i need more counters or discards in the main deck, is there something im sacrificing in the side board that i should be giving up some of my creature control for isntead?