if your new to fluff chucking ,stick to this simple process.
Tuck your elbow into your side and dont let it move away from your body.
only use your forearm from the elbow upwards to move the rod in a 10 oclock to 2 oclock movement
You will find if you hold the rod with your forearm horizontal the tip of the rod should be at 10 oc mark, when you bring the rod up so your forearm is vertical the rod should now be at the 2 oc point, this is because of the angle your wrist is giving the rod.
short lines , faster rod movement , longer lines slower movement and dont forget that short pause at the top of the back stroke to let the line straighten, its all about timing, practise will improve you no end.
this is a very simplistic method, but i find when my casting goes alittle boobies up ,i revert to this method and within a few casts im back to normal, i dont double haul in the true sense of the word, although i do put a long line out

just get some yardage of line in the air and then release on the forward stroke as the line straightens, allow the rod and line to do the work , if you put loads of welly into it you aint doing it right. If you want to pay of tution then make sure you get a good instructor, ask around

it wil pay dividends in the long run