Racking is siphoning the brew off the seadiment (dead yeast cells) in to a fresh fermenter to allow the brew to clear beter.
Priming is adding more fermentable sugars to the brew then sealing it in a bottle or keg so it ferments again, this time trapping the co2 to make the brew fizzy.
For general purpose wines / ciders you can buy tubs of Youngs all purpose wine / cider yeast, just add a tsp per brew.
You will find with time and trials that although this works fine, other specific yeasts give a different / better taste to the finished brew.
Start off nice and simple and then progress as you gain experience and confidence..... but keep asking the questions, its all part of your new brewing education
For the record my first ever cider was apple juice, sugar and strong black tea whacked in a demijohn with some bread yeast and it was so good i've not stopped brewing since.
