Have you already completed all of the required quests to finish Recipe for Disaster? If not, that would be a very good start.
Aside from all of those, try to complete all of the F2P quests first, as those are the easiest source of quest points. After you have done those, go to
this page and click on the links to the "Beginner" and "Intermediate" quest lists. These are lists of the easiest quests to do in Runescape, quests that don't require a lot of skill levels, wealth, or combat situations.