You're indirectly talking about buying only dips here, newbies aren't supposed to be encouraged to buy simply because there's a presumed dip but should get started and continue buying regardless of the market price movement. For a good discipline, as long as newbies are sure they have discretionary income present,
It will never be logical to just wait for a fall. Rather, it will be a waste of time and lack of confidence. A new investor should never be encouraged to fall. Buy from the current market price, but keep the investment management consistent even through the DCA strategy.
If there is a fall while your investment is consistent, try to buy more units from prudent income.
And keep an emergency fund and backup fund along with the investment. The emergency fund will be your danger companion that will save you from sudden danger.
Follow the DCA strategy while investing in the first stage. And try to increase the portfolio slowly. This will make your investment sound and risk-free.