If you are talking about adding new abilities or changing existing abilities, this topic should be in the other battle systems forum. I can see some confusion you have though with the monk rotation and the majority of these can be very quickly fixed with the right macros.
Basically, the monk abilities are set up in such a way where you cannot trigger the next ability in the chain unless you've done the pre-requisite move. Consequently, most players have set up two macros so they only need to press one button for the "flank" combo and one button for the "rear" combo. It does require you to level up monk and gain all the abilities to work, but your basic idea can be done with macros. The only issue is you may have to deal with a clutter of error messages in your battle tab (if you are calculating your dps that way) unless you disable it.
Anyway, an outstanding thread someone posted for the full rotation is here. I'll run through the code to explain it for you though.
Flank Combo
/ac "Demolish" <t>
/ac "Twin Snakes" <t>
/ac "Dragon Kick" <t>
/ac "Shoulder Tackle" <t>
You start in Opo-opo form where demolish and twin snakes are not allowed but Dragon Kick can be used. The game returns error messages on demolish and twin snakes instantly before successfully performing a Dragon Kick and switching to raptor form. Shoulder Tackle returns an error message as it is on global cooldown.
In Raptor Form, you press the same key. Demolish returns an error, Twin Snakes is executed, and you are in coeurl form. Dragon Kick and Shoulder Tackle return error because of global cooldown.
Coeurl Form executes Demolish, resetting to Opo-Opo and +1 stack of Greased Lightning. Subsequent actions return error because of global cooldown.
Shoulder Tackle is executed if you are ever out of range and none of your basic combo is available.
Back Combo
/ac "Snap Punch" <t>
/ac "True Strike" <t>
/ac "Bootshine" <t>
/ac "Shoulder Tackle" <t>
Same concept as the rear except this combines all abilities that benefit from positioning at the back of an enemy.
Any other skills you use (silence, stun, dots) are on separate hotkeys. Feel free to write your own macros for those, although they are not necessary.
These macros help a lot with the accessibility of the monk and nobody will denigrate you for not using them. It in fact allows you to focus more attention on other skills like silence and stuns, which are helpful in helping your party handle certain boss mechanics and will more likely earn you a compliment for being "pro" than "noob" (assuming people even ask).
Feel free to edit the above macro by appending buffs or /micon commands according to your preference. Keep in mind, until you unlock some of these abilities (or are running lower level content such as FATEs and dungeon roulettes), you may want to substitute appropriate finishers and starters. Dragonkick in to Bootshine, and Demolish in to snap punch, or build them in like so:
Flank Combo
/ac "Demolish" <t>
/ac "Snap Punch" <t>
/ac "Twin Snakes" <t>
/ac "Dragon Kick" <t>
/ac "Bootshine" <t>
/ac "Shoulder Tackle" <t>