Herblore

Herblore is a members-only skill. Before you are able to use it, you must complete Druidic Ritual, which will give you enough herblore experience to boost you to level 3, which is the first level at which you can make potions. There are a few things you will need to create a potion: a water-filled vial, an herb (like a guam leaf), and a secondary ingredient (such as an eye of newt). For some potions you will also need a pestle and mortar.

Herbs
There are many herbs you can obtain for use in herblore. Below is a table listing all the potions that you can create.

Categorizing unidentified herbs
You would start by arranging them in reverse order of stock, since it is highly probable that you have the largest stock of the least valuable herbs. Then you need to find a friendly player with high level herblore, though you have to trust them not to substitute lower herbs - or just give them one of each herb to keep, in return for identifying, so there is no reason for them to cheat.

On that basis, you take at last two from each pile, get one identified, then line the unidentified ones up so you can remember what they are.

Once you have a full set of "known unidentifieds", and place them in the bank, in order, then you can use them as a template - just make sure not to lose the ordering by drawing out the last one.

Draw out cash, one example of each one you want (eg. "above ranarr"), and filler items so there is no extra space - rune essence or food makes a good filler. Since there is no additional space, you will only be able to accept herbs which stack on those you are already carrying, so if you cannot complete the trade, either there are herbs that are lower, or ones that you have no template item for.