the book, The ABC's Of Reloading is an excellent book to learm many of the basics of reloading. it will walk through the process step by step. pay very close attention to all the safety guidelines and procedures, as they are there for very good reason, your safety.
reloading can be a very safe hobby or addition to shooting if done properly and safely. if not, there is the potential to do great harm to yourself and others. again and i can not stress this enough, follow he procedures and work safely.
buy and read several load data books. one of my favorites is Lee's Modern Reloading data load book. it's a load data book along with it goes into much detail about the reloading process. lots of good information in that book.
first thing, get the ABC's of Reloading and read it then reread it several more times. then if you have any questions come back here and ask them.