If the bike is tubeless ready, it'll already have tape - just check and make sure there are no scratches / splits / cuts otherwise you'll discover the joys of looking for where the leak is....
You'll need sealant - see the other thread. There are a few tyres that advertise as not needing sealant ( goodyear ) , but I gaven't used them so can't comment.
NB the main reason mtb riders like tubeless is it stops impact / snake bit punctures. If you're not getting them do you really need the hassle? I'm running 3/5 of our family mtb's tubeless , it's just not worth the hassle for my youngest daughter ( light enough to not get impact flats) or my wife ( she doesn't enjoy rock gardens) . New sealant every 6 months , or each time we replace a tyre. Sliced sidewalls still need a tube to get you home. Even the best sealed wheels seem to need pumping up every few weeks ( admittedly we run fairly low pressures do they might be burping on rocks)