^This. Also you can have as many offline shops as you wish. The best way to make adena is a classic "buy cheap, sell expensive" - it can be COLs (premium currency), proofs of blood, enchant armor/enchant weapon, Talisman Crystals, Energy of Insolence etc., then you can start buying out mats and recipes/keys for stuff which you craft and sell with surcharge... Overall the no limit on shopping windows open a great opportunity to make some mad adena for those who are willing to put enough effort and time into trading
btw. to get the 'input capital', I'd suggest making a spoil and rushing it to level ~50 - then you can go to Enchanted Valley and spoil Enrias from Forest Runners.