For the initial launch we have the following items:
These items are available via the fortune wheel. We will have options to sell items directly in the near future for faster access to them.
There's also a small chance to win them from item drops from the PvE campaign.
As the items are not easy to come by, it would be ideal to save them until you really need it. Using too much items in lower levels would meant that you may have to buy them at a later stage.
You should also keep your items for PvP matches in the future.