Collect everything you can find especially in Bleakrock Isle and sell them or keep them as crafting resources. There are many pickables too. Iron ore is the most lucrative one. The price can fluctuate, and you should be cheeky enough and ask people to give you offers. Once you get a monstrous offer, you can make big money.
Improving your crafting is a good way. For example raw iron can be smelt into ingots, which can make more Wildstar gold than raw iron. Another way is to deconstructing weapons and armors. Precious enchanting items may drop and can be sold at a high price.
There is no auction house in Wildstar so you have to try all trade. (You need to follow some simple rules before you do anything.) Make use of chat channels and go to guild stores often. Put up your WTS or WTB and go to the East Common Bazaar territory. If you are not in a hub and trust guild members, you can send them materials and hope for payment. But cash on demand is always the best choice.
Players are allowed to join five guilds in Wildstar. Hawking your wares in the guild store and try to talk to people and offer wares constantly. Pay attention to the criminal deals that offer a unbelievable crazy price because guild stores are the place for criminals.
Cutting your prices initially is a good way to get your business running. Be friendly to all those who come to you. If you are trustworthy, you will create a customer base and you will get a constant stream of income.
With these tips in mind, you can go and trade. You will definitely make a lot of Wildstar gold if you indulge in the art of deals. Have fun!