You can buy pickling jars, but it's cheaper to use ones that you've saved up yourself.
Jars with vinegar-proof lids are needed, i.e. coffee jars with plastic lids are ideal. Wash the lids and jars thoroughly. Plastic lids can be sterilised by placing in store-bought sterilising fluid. Jars can also be sterilised in fluid. Follow instructions given. Or you could sterilise the jars in gently boiling water.
I prefer the oven method as I feel it is less likely to cause accidents.
If using the oven sterilising technique, metal lids can be put in the oven with the jars. Lay the clean jars and metal lids to warm in very cool oven, Gas ¼, 225°F, 110°C. Whilst they are sterilising make the pickle.