What exactly are you aiming for?
Do you want a level made specifically for taiko or CTB? If you do, then go to song setup -> advanced and look under Mode Specific for a drop down selector and choose the mode you want.
If you want to edit a standard osu! map see how it affects the taiko and CTB version, play around with the hitsounds, use different sets of circles and sliders, and change the coordinates around. The hitsounds and sliders in an osu! standard map affect how the taiko map plays out (read
viewtopic.php?f=13&t=31560 for more specifics) Similarly, CTB is dependent on sliders and the x-coordinate of the notes in the standard map. If you are trying to make an osu! standard map, make sure you prioritize making the map play well in osu! standard before optimizing it for other modes.