Play as aggressive as possible to push your lane early game then ROAM as much as you can. the number 1 problem with lower elo mid is that no one roams. fallowed by farm. and while a lot of people say farming is number 1, however if your farm is as good as the enemy mid. you will do fine. Roam to get kills and give kills. but also to apply pressure to other parts of the map. make you enemy feel unsafe. after your first kill you should be able to snowball your lane. have your top come and watch mid every once in a while so you can help bot and jungle with dragon. once your team has 1 or 2 dragons push as much as you can. don't wait for a full build. win as soon as you have a nice advantage.