Depends on their knowledge. No knowledge, dca is probably best. Get them the Bitcoin Standard as soon as possible

I like 1/3 now and rest DCA yet depending on the budget that may still cause some stress if there is a drop. Definitely need to dip the toes in and start stacking though. I guess I’d say start slowly but learn as much as possible so you can ratchet up dca/smash buys asap and get a good stack accumulated.

I find getting them into lightning with the bribe of some sats is a good way to peak their initial interest. Then I suggest buying a small amount every payday with a no kyc p2p platform like peach bitcoin