Ok, How the F do i "practice a rotation"?

Pretty much the title, i play Ret Pala and i love the spec because of its simplicity (aint no time to learn playing with 30 buttons rotation) but my dmg is definitely lacking.

How do u guys practice rotation? Do u Just spend time hitting the dummy? I feel like im lost because of the Said simplicity and its giving me a hard time to improve. Appreciate any tips tyy

Edit: thanks for all the responses, definitely Will be spending more times at dummies and sry for the lack of context, im at 2370 io atm and i Hope these damned dummies will help me in this journey!! Tyy