Do not repeat information in your sample chapter that you will cover in earlier chapters. Cover only the information in your outline of the chapter. One of the goals of your outline is to enable editors to understand the context of your sample chapter. If you feel they need to know something from previous chapters to understand your sample chapter, include a comment in brackets that alludes to what you covered earlier and, if you must, explain it concisely.
New Agent Alert: Aria Gmitter of the Whimsy Literary Agency
New literary agent alerts (with this spotlight featuring Aria Gmitter of the Whimsy Literary Agency) are golden opportunities for new writers because each one is a literary agent who is likely building his or her client list.