Back to TT after 24 years

I have a Rega Planar 3 with RB 300 tonearm and Linn K9 cartridge that has sat idle over the last 24 years. My Rogue integrated amp has a built in phono stage,so I wanted to throw on a few albums every now and then.

My question is what do I have to do to get the Rega back in service? Is my cartridge adequate? How can I tell if the weight is set right for the cartridge? Do I need to buy an audiophile grade phono cable? Where should I start?

Thanks,
Jack