In general you are much better off infusing your spice into the plant material rather than sandwiching it.
This solventless method is quite simple and effective.
As for herbs to use as the base, just go for something that is pleasant to smoke on it's own. Some good options are things like blue lotus, chamomile, mullein, passion flower, or damiana. Cannabis can interfere with and ground out the effects of DMT so it's generally recommended against using it, though it is another possibility.