First thing first....pray that u dont get noobs teammates :D.
Couse if u do, neither THE GOD MODE cheat can help u win this one :).
1. Buy boots and 3x hp potions
a- take Q spell and play deffensive untill lvl 3
b- lvl 2, chose W spell and u will be able to survive even more
c-lvl 3, chose E, now ur complete for the first blood :) or at least to steal someones kill :)
2. now buy armor that gives u 40 armor points and start building first sunfire cape.
3. if ur lvl 6, scope the map and see if anyone needs to be saved :)
4. OK u saved someone...."tnx shen i owe u one"!!! Now buy some new boots, ninja tabi or one for magic resistance
5. Now Farm and always bee with ur teammates...because u need to take bulets fired at them. Always go first, always rush and be crazy :)
6. IF u have gold and 3 kills go buy some more items...like armor for hp regen or similiar.
7......ups....i g2g....to be countinued :D