Early game you are pretty squishy so I wouldn't advise to counter-gank or invade.
I still always start bot side buff out of habit from s3. After taking the first buff you'll get to level 2 so take a point in Ravange. Rush to the second buff to make sure you don't get counter jungled. Some junglers take small camp in-between buff camps to get to level 3 after the second buff. This could open a window to get your second buff taken while you are taking a small camp so rush to the second buff to make sure this doesn't happen. Take a small camp after your buff camps are done.
At level 3 look to gank a lane, preferably mid or top since you only need to worry about 1 champion. Ganking bot early might get you killed since you're squishy early game. If no lane is in a gankable position, keep farming your jungle until you get to level 4.
I think at level 4 you should really look for a gank and if you can, get the kill so you can start to snowball. Before you gank, I'd advise to ward the lane you are ganking in order to look out for a counter gank.
One your first back you should get
, along with a
or 2 if you have enough. Get 2
if you are behind a little and you want to farm your jungle more.
Keep ganking and farming your jungle until you get some more items under your belt. If you've gotten a few kills and are feeling ballsy, you can try your luck with counter-jungling but be careful if the enemy jungler is a strong duelist.