Spend the money up front and buy Ian Skennerton’s books “The Broad Arrow” and “The Lee Enfield, a century of Lee Metford and Lee Enfield rifles and carbines”. In addition to those there is a huge amount of experience and knowledge on this site as you can see as you have already got good responses to your questions.
Be careful on sites like Gun Broker. Do your research before you hit “buy it now”.
Watch out though, when one shows up, usually others follow!