Avoid red dragonhide, it does not sell well and OSRS gold you should stay clear of seeds as they're the scourge. I've lost an absolute fortune from them. The method is to look up the graph over 180 days and see what bounces continuously between two points. Then buy and sell prior to when they meet, it requires some time and practice, but eventually it's possible to earn incredible profits of around 1-2 million everyday...do some woodcutting or slaying at the same time so you are not wasting time either.
Herb running (in terms of) is the process of running between all the herb patches typically in the most efficient method. It takes time to master an effective route that runs among the ones in the water (forget what it is called) and the one near draynor manor as well as the one in the north of ardy, the one located in Catherby, and (if the quest is done) the patch in Trollheim.
The objective is planting (usually) that most lucrative seed of the herb which will yield the highest money when harvested. I'm not quite sure of the ideal level at which to begin or even the current price. But, I wouldn't suggest you doing it with your current level until you have access to several more herb options.
Participating in Fairytale Part 1 is a huge benefit due to the secateurs that boost the amount of herbs that are collected. Another suggestion if you're looking to perform some herb-based runs in the near future is to invest in The Herb Scroll by Dungeoneering in order to allow for a "money back" if you are lucky. Additionally, playing Ghosts Ahoy! will provide the ectophile that allows for an easy access to the swamp. By completing the lumbridge/draynor tasks, we will help you to have an easy teleport to the Draynor patch.
When you farm, you must make sure you use supercompost on a regular basis. Particularly when trying to earn a profit on the herbing. To clear up any confusion, you can't pay a farmer to keep an eye on your plants, but you can just pay him to supervise the plots of vegetables and cheap RuneScape gold fruits inside the allotment.