Merch is a wonderful first class~
With Discount and Overcharge, you'll be flying high in beginner zenny~
I would say start a thief class, they're easy for beginner's and deadly for pros.
After leveling it a bit, you could head to Toy Factory and steal cakes from Myste Cases; Then, sell them in a shop on your merch when you go to bed xD [Leave the shop open all night

] for about 3.2k each... easy money~
OH YEAH, and welcome to aRO~