There are many free guides out there. What you need to do is create your own guide. Some free guides include collecting items, as in the receiving character picks up the desired items, sells to the sending character for max trade price, sending account drops, repeat. You can also create junk. Look at the Grand Exchange prices to make items, see how much profit you make regardless if it will sell in the Grand Exchange or not to see what items are needed to make the desired item to create junk profit to trade to the sending account which the receiving account has the junk on creating a junk trade method.
If you want to find a collecting method, check places that spawn items (Kalphite Lair, Waterbirth island, ect) for items that spawn relatively fast that you can trade to another character for profit.
For junk trading, for instance bows. You'd buy willow logs and create willow longbows (u) which is a round 4x your profit per log as a prime example.
Hope this helped, feel free to PM me with any questions you may have.
