about poles
Telescoping poles are widely available & come in a wide price range. Check REI.com. When compressed, they will easily fit into checked luggage.
Hiking essentials:
Duct tape! One of my poles would not stay extended on a recent hike in the Grand Canyon. Another hiker at the trailhead had some first aid tape, but duct tape is the better option. Several of my hiking buddies have had problems with the "hold" on the telescoping poles. And who knows what other problems it might solve during the trip.
Blister Block! They are so much better than moleskin (or duct tape). You can find them at REI, or nearly all drugstores. They are super band-aids. Ideally, you apply them before you get a blister, when you feel a hot spot. Or if you know, you have a spot that blisters, use the blister block as a prevention.
Ibuprofen! Saved my hips on a 14 day hiking trip. Pack some.
Not essential for most, but if you're training in warm areas, you need to restore electrolytes during your hike. I use Extran, but Gatoraid or any electrolyte replacement product will work.
There is some great advice above about training shins & calves. Don't forget the ankles. A BOSU is great, but foam rollers, balance boards, & yoga exercises are great training tools.
Debra