It's situational...
The thing about elise is her early game pressure is the best thing about her, if you haven't ganked a lane withen the first 4 minutes then you're either too slow or your team is overextending lanes.
To achieve this I usually do Gromp/Krugs then double buffs, then rift scuttler, then gank top lane to get my top laner (or me) fed. If I can I'll rush immidiantly to mid lane, gank, and then I'll finish clearing all the camps I missed, or just finish clearing.
If I start on red side, (their red is near top lane) I'll try and invade their red to kill their jungler after I ganked top/taken rift scuttler. (It's easier to invade top side red since the bushes provide better angling and stealth, if it's blue side you can easily be counter invaded by their mid/top)
The situational part is if you know top lane is fine without you and it's bot lane you need to focus at... in that case you want to do a full bot jungle clear (gromp+blue+wolves OR krugs+red+raptors) and then gank either bot or mid at level 3.
As you play elise and learn to be more aggressive (this will take awhile since practicing her executes take time) you'll develop you're own path with the situation.
(Also I start with these: you can use regular pots for practice substain but elise is so strong as camp clearing you can sometimes get away with not using pots at all. I wouldn't waste gold on the refillable upgrade at all tho)

You'll do fine with her, just take your time and don't worry about mistakes while getting used to her combos. I can't really list combos since those are situational as well (you're either ganking in spider or human form, depends on the chase ability) but you'll get used to it.
[slayer-jinx-catface]