New to Turntable - what're involved in playing LP?

Hi, I'm building a 2-channel hifi system around my Harbeth P7ES3 and are interested in getting into the turntables. BTW, I had no prior experience with a turntable.

What steps are involved in playing back LPs? Is it a complex process?

Can someone explain to me what compoents/tools I need to get in order to setup the turntables/tonearm/cartridge properly for an excellent quality playback of LPs?

Or am I jumping too far ahead because I may need to upgrade my digital source (CD or SACD player) first and find the amps for my Harbeth?

Please share your thoughts and experience.