Here's a quick guide on how I got to 99 hunter!
First of all, you are going to tap the hunter icon and select "Teleport: Puro Puro".
Once there, you'll need to trade the hunting expert and buy the butterfly net including 14 impling jars.
Once you've bought them you can start hunting. You're going to train at Puro Puro until you're hunting level reaches 63. The following imps can be caught to reach that level.
Level 1: Baby Impling
Level 22: Young Impling
Level 28: Gourmet Impling
Level 36: Earth Impling
Level 42: Essence Impling
Level 50: Eclectic Impling
Level 58: Nature Impling
After reaching reaching level 63, you're going to bank/drop the impling jars and buy boxtraps. After you bought the boxtraps you'll need to click on the hunter icon again and tele to Karamja. This is the place where you will catch chinchompas untill you're level 99. My favorite spot is showed in the picture below.
Good luck hunting, if i missed anything let me know.
PS: selling all the chins to the general store will give you 40m!!!