First, go find Caitin at the Grocery Shop.
You can find the Grocery Shop right in the middle of Tir Chonaill Square.

Go inside the Grocery Shop and talk to Caitin about 'Trade'.

After you click on 'Trade', a window will appear with items you can purchase.
You will notice the different tabs on the window.

Click on the tab that says 'Quest'.
You will see a variety of available quests you can purchase.

If you want to know what each quest is about, simply place the mouse over the quest.

Let's try purchasing the quest on the very left.
Once you click on the quest, a window confirming your purchase will.

Select 'OK' and drag the quest into your Inventory.
Press 'Q' to open the Quest window and you will see that you have a new quest.

However, know that there is a time limit for purchased quests. You will have to complete it within a certain time.

Time will start once you purchase the quest. It is important that you finish the quest within that time or you will not receive any reward for it.

You can simply drop quests that are expired on the ground or you can quit by pressing the 'Quit' button.

Since you can read what the quest is about before you purchase it, have all the necessary materials for the quest ready before you buy it. Also, don't forget to click on 'Complete' to receive your reward.

As long as you remember all that, you should have no problem with these quests.
Now you're ready go!

Try earning easy money and EXP by helping different NPCs around town.