Careful planning may be necessary to avoid trade good wastage in player owned ports. RuneScape players who are late to start on their ports have the advantage of learning from the mistakes of those who went before them.
Apparently, there is a cap of 250 spice, and it would be assumed that this cap applied to the other resources as well.
Firstly, prioritize scroll missions above all other special missions. RuneScape players ideally need initially 20 successful scrolls to even be able to use each type of trade good.
Special missions must be done that day or they go to waste, there is no way to save them. Regular missions can be saved indefinitely, but only three can be parked. Therefore, trade good runs ultimately must be sailed or lost. Storyline trade good missions are the only ones that can effectively be "saved." The same story will spawn for that adventurer until it is done. As adventurer storyline rewards give the most trade goods, they can be strategically shelfed if there is a need for there to be more scrolls obtained first.
Start by unlocking rocktail soup. Spices are the most common trade good resource. Next, unlock tetsu plate. The reason is, two adventurers give plates as opposed to one for lacquer and chi. Then focus on death lotus body, sea singer top, and a scrimshaw. Currently, gem finding scrimshaw gives approximately 500k worth of gems in addition to 0-2 onyx, making it likely to settle at 2-3m. If another scrimshaw has stabilized on the grand exchange at a higher rate, learn that one instead.
Then complete the scrolls for the legwear in all three armor classes, followed by the hoods. Lastly, unlock the rest of the scrimshaws.
RuneScape player owned ports guides main link hub page.