When you first start learning reiki you need to get yourself a good quality book from your local bookshop.
Th best and original form of Reiki is Usui Shiki Ryoho Reiki and is the from of Reiki on which all other forms of Reiki are based.
It is the form of Reiki as taught by the founder of Reiki, Dr Mikao Usui and then through Chujiro Hayashi and Hawayo Takata
It is important to remember this as many Reiki forms will often tell you that they are the best or most original form.
This is not the case, so beware of any Reiki Masters who tell you this!!