Are you going to plant some winter onions?..if so, yes..you need to get them going ASAP.
In spring you can stagger the planting..so you have some to harvest earlier and some later. Generally I don't bother staggering as such..as onions keep so well, once ready and lifted they are in no hurry to be used up. But if I do plant different varieties, then I tend to plant each variety in one go..varying times.
BTW..there is no stupid questions..If you don't know something..you have to ask.. ;) You might not get simple answer..but this is my take of it.