Proxy the first minion wave except if they see you or your jungler needs help because he refuses to go bot first. On the other hand, purchasing multiple Dark Seals (which is most effective around level 6) now makes Singe also capable of farming in lane.

Only go double proxy when your team is near objectives because you generate a lot of attention if you are inside their base.

Help your team or go proxy whenever possible. Placing a Zz'Rot Portal while doing so helps you keeping the pressure top.

If you have died very often try to put more pressure on the map where you want your opponents to be (e. g. bot when your team takes baron). Make them chase you because they will take damage, loose time and only get 50 gold if they kill you. Stop doing that if you get an assist (will cause a soft reset) or a kill (will cause a hard reset).

In early game you could also chase a camp (wolves or raptors, not trying to kill the biggest one). By doing that and killing three minions you reach level two.