Which monster should  I kill for profit? My stats are in the banner below

Green Dragons, work on dungeoneering in the mean time for Frost Dragons. 

I don't know how much capital you have to start, but notepaper for the bones and signs of the porter to auto-bank the hides should make that cake. Again, that's assuming you have some money to start.

 

Vleademir.

The best monster for you would definitely be cockroach soldiers.

 

You can do a load in about 5 minutes if you are fast enough and pocket about 700k per hour depending on the drops.

 

You would also get a lot of crimson charms and a few valuable rune item drops.

Stick with slayer xD