It's tougher to take a clonen off a young plant, so if it's older than 30 days, that's good. Make sure the plant is in prime health and go prune off some branches, lol. Make sure you get at least 3 nodes, and one node should be buried. Leave a little stem below the node so you don't damage it.
A high RH is going to be key. You want to nearly stop transpiration during rooting process. It needs very low levels of light or you'll cause cannibalization -- a little yellowing is fine, too, but you can root plant sfast and have them healthy looking, so it's a good goal to have.
once some roots have formed - usually see a very noticeable uptick in growht out of nowhere - you can start to give more light.
there are numerous videos you can follow. Look up the rubisco video about cloning on youtube.
www.youtube.com/watch
www.youtube.com/watch
www.youtube.com/watch
Keep it simple.. you can overspend on magical stuff that won't help much. A cheap root hormone might help but don't pay for clonex brand that uses same exact active ingredient as everything else, lol. Low transpiration, low light... patience. A very mild charge of nutes in medium is fine, too.