Get these late-game
I'm too lazy to make all this stuff, you don't have any cc so you should farm and gank when you see a good opportunity. You're not a good 1v1 champion, so try not to get in contact with the enemy jungler. Buy wards and get map awareness. Pink wards are really strong since they last forever if not destroyed, so get them and try to place them in places enemies are not likely to check. (the small brush near dragon and baron is a good spot)
You should pick Ghost, because you can stick on to your target, or escape.
Smite is a must for a jungler. You can use it to make sure no-one steals your buffs, Dragon, Baron etc.
OTHER GOOD OPTIONS
Flash is also a good summoner spell.