Generally don't play too aggressive until 6 unless it's a piss easy lane like Veigar, then you can really do whatever as long as you have info on enemy jungler. If matched up into AD champs (excluding ADCs) max E and spam it as they mostly spam spells to CS or poke (Yasuo,Irelia), you can generally fight them at lvl 4 if you poke them down to 450 or under. 6 is your biggest spike, into weaker laners you can basically 1 shot at this point with a 2 stack R and ignite, if the matchup is a tougher one like Zed you atleast get an easy escape and reengage from his R. At this point you can also start looking to roam, if you have Doran's Ring + Blasting Wand you can 1 shot most bot lanes at lvl 6/7, top lane could also be a viable option if your laner has cc and enemy is pushing 24/7. Monitor your jungler's movement and enemy jungler's movement, stick to your jungler's side of the map and help him out if he needs it or look to gank a lane with him and secure an objective after (Dragon,Rift Herald,Tower). Basically do this throughout early (post 6) and midgame. If your team is behind enemies' and there's no way for you to get any kills on the map even with teammates' help just focus on farming in a sidelane if you can without overextending. Stack up your gold and get your spikes (Archangel, Sheen). Trying to get lvl 16 with this build isn't a goal, so don't have your mind set on that too much. Your priority is gold for item spikes and getting your E/Q Max (lvl 13). Look for teamfights, clean up if your team starts one, if you don't have any engage get a Stopwatch and be the one to engage (Flash-R to enemy backline for example) or stay out of vision and R in. After 3 items you should be 1 shotting non-tanks left and right. Be sure to keep up vision on the map and be aware of your teammates and enemies.