I do a lot of canning and it would be best if you were to either invest in The Ball Book of Canning (probably around $7) or contact your extension university or a government agency.
You will need a canner (large pot with rack), the canning tongs for removing the jars when done, glass jars, lids and rings.
Depending on the type of food(s) you want to can, the size of the jars (half pint, pint, quart or 1 1/2 quarts) will depend on how long they are to be in the canner.
Everything needs to be sterilized to prevent bacteria from setting in.
If your jars do not seal properly - you may need to try it again or opt for freezing (depending on the food).
Some veggies need to be blanched first.
It's a great thing to do - please don't get me wrong - but there is a lot of detail involved for your canned products to turn out right. The Ball Book is a great book and it can tell you so much and is packed with recipes.
It's too much detail to get into right now - but if you get the book and read it and have questions - then it is easier to help you.