Do you have any kit yet? It not, the first purchase should be a reloading manual (as mentioned above) and the Lee one is pretty good as it gives background as well as data. YOu may decide not to reload after doing a bit of reading and looking at kit and consumable prices.
Lee do a .223 reloading starter with a handpress, dies, priming system, etc. (Krank sell this, just had a mate buy one as he is starting out too) which is a cheap way to try reloading, but can be expanded on with other calibre dies and is more akin to using a "proper" press than the Lee Loader (one box and a hammer) route. You will still need a set of scales and other ancillaries (many, many ancillaries

) but it will get you started.
With reloading, if in doubt, ask. BUT be prepared for lots of different opinions and do not use anyone else's load data. Work up the load yourself and observe the min and max give in the reloading data source.
Regards
Mark