Zac's combos are surprisingly basic.
As Zac jungle you want to commit to your gank with E follow it up with Q and then W.
If you have your ult and want to use it is the exact same except R is after your E and before Q.

Basic Gank Combo:
E+Q+W
Ultimate Gank Combo:
E+R+Q+W

These are really the only 2 combos you need to know. Other than that there aren't many others that are super useful.

Flash+Q is a good combo, but you use your flash which could put you in a bad situation.

For jungling you want to start with Red Buff, then raptors. Usually, you will go for wolves which should get you to level 3. After reaching level 3, you can easily get an early gank (especially against champs that have no movement abilities). My playstyle with Zac is more based around roaming and ganking.

Pros

Tanky
Hard to kill
A lot of CC in kit
Good team play potential

Cons

Easily dies against multiple champs solo
Not good 1v3