Usualy you want to do a 5 camp clear and then go to crab then look for a gank oportunity, when starting blue side, clear Red > raptors > Wolf > Blue + gromp > Crab, when starting red side, clear Blue + Gromp > wolfs > raptors > Red > Crab.
Optimize this path as much as possible, by the end of it, you should have around 550 gold, if you can, gank mid lane then path thowards the oposite crab, if no gank oportunities are avaliable and you know the position of the enemy jungler, invade enemy jungle, if you manage to get early 2 kills/ganks, you should have around 1100, ath this point back off and buy Serrated dirk, doing it fast enought will turn you into an absolute monster in game, being able to carry all the laning phase.