Hi Sara,
These are really serious walks which need good sturdy walking boots and walking poles - the comfier the boot/walking shoe the better, a good idea if you're buying new boots is to wear them in a little - a rucksack for holding a water bottle and light snacks jellies etc which are great on long walks and muesli type bars.
Light but walking type clothing would be recommended and again a layer for when walking in shadier areas - I would recommend for this walk to put a little practice walks in before you go on tour - have a look at the miles/km's the walks are and get out and about and enjoy!
Best wishes,
Just You Team