Start Q and try to land them from there with idea situations. like if your adc took a hit, Q and heal. By any means you are forced to start E, You can go for autos and proc it that way for early levels.
They typical trades you want is W, AA, Q, and E out. They will proc all 3 tributes in one go. And when your C/D finished, go in again when you're able to. Even for a pointless trade, you will get your gold to complete the quest.
The main goal in it is getting the tribute finish which can be done 10-12 minutes into the game mostly for me at least.
The scale on ap is good as most of the support items have AP on them in the mix. but Rakan's scalings is pretty high-ish, so you can do well with small amount of AP to have a better end-game. Its not really aim to have the most AP, it just helps.
~
The game here may be a lost, but I got a normal S rank, but you can see what I build, runes, masteries I use. All I need is teamates that are willing to tryhard to get out bronze without wanting to /ff every second of the game giving up. xD With this build, I was normally the last one to drop while being the one to initiate everything as the Stoneplate is just so good on him.
http://matchhistory.na.leagueoflegends.com/en/#match-details/NA1/2495357361/230598164?tab=overview