i am sure that i did the right soil prep but they are puny and not too
vigorous.
any advice about how deep and how much manure to dump in the hole?
there must be a secret to it

I'd resist the temptation to put manure in the hole unless it's been well
composted. It could cause all sorts of problems otherwise. Putting a manure
mulch round your roses might be a better idea.

Your post seems to firstly hint that you've planted the roses and that they're
not doing so well, and then seems to hint that you're ready to prepare the
holes. Maybe you could clarify the position that the roses are in at the
moment. I wouldn't suggest you dig up roses that you've planted to have a
second go at getting the planting conditions right. Roses may well be looking
a little past their best this time of year anyway. It is winter after all.

Dave.