To start your magical trade journey, you need a few things built and researched to insure your trading experience is nice and smooth, easy peasy. 

First, you should have your Market Place upgraded. I would probably recommend level 12-15 to start,

but if you wanna be a pro, max out that bad boy.

Then, you gotta do the boring stuff. Research

These are the Mandatory things you have to research to do Faction Trading, the most profitable trade.

1. Guilds

2. Merchant Guild

3. Factions Market

4. Trader

6. Trade Office

7. Pocurment (Buying)

8. Selling 

These are the Mandatory building you need to build

1. Marketplace (Duh)

2. Merchants Guild

3. Trade Office

These are the mandatory units you need trained

1. Caravans

2. Trader (At least one)

So, you got all of those ingredients for a perfect, trade cake! Now all you gotta do is mix that stuff

up, set the oven to 350, pull that baby out after 15 or so minutes to cool,let set for several minutes and BAM! You got a tasty Trade Cake!

So you should have a gold-hogging trader, a decent ammount of caravans, some stuff to sell, and some 

gold (Hopefully). The first thing you want to do, is send that trader to a Hub. 

I recommend Centrum, the big, scary looking one. Coordinates are at 0|0 (Pretty easy to remember)

Centrum is, in my opinion, the best, mainly because its the only really active one in Illy. Most

other hubs are just used for storing junk for later. You don't necessarily have to use Centrum, 

but trust me, you wont have much luck anywhere else. If you really wanna make some money, you sell at centrum.

So you got your fancy little trader, right? Now you just click the middle of the big, scary, spiky ball

of who knows what, and click "Send Trader". Easy, right?

While you're at it, send some caravans too. Send the stuff you wanna sell, and some extra gold for  taxes (Taxes can be a bit of a pain). So depending how much you're selling, I'd reccomend between 10k-75k. You do that by clicking the big, tower ball, and click "Send Resources". 

Now, you wait. While you're waiting, why not chat it up in GC? Theres some lovley people there

If you followed step 1 correctly, you should have everything built and researched to set a sell order

Doing that is quite simple.

Go to this little menu, the market one.

Go to the top right, and select the location your traders at, or in my case, Centrum

Click "Place Sell Order" or later you may need to buy something, you'd press "Place Buy Order"

Set the quantity, and price per/Item

Now the bottom half of the menu should be simple. Remember that gold you sent? That will be used for the taxes. 

The default tax rate is 5%, so it'll cost 5% of how much you're going to get from selling your stuff.

Click "Place sell order" aaaaaaand

BAM! You did it!