You should allways follow their request rules such as if they have a format for which parts go where you should follow that format. Other rules may be stated, such as dont get angry, dont use profanity(dur), be polite when asking.
these rules will help you to be nicer on pmc and get better results on the projects they're creating for you.Don't be lazy either. If you can do something worthwhile it would help others and possible get you diamond,but i don't waste time on people that are capable of doing things themselves i also don't respond to rude smirks layed down by all the jerks out there who probably have nothing better to do than try and ruin your creations.