Great my dad won't leave me alone now and wants to answer all these friggen home improvement questions LOL he says that you need to give more information on this for him to answer it properly.
All the advice I've found assumes the sink drain will be exactly where it was in the old setup. That is very often not the case! My sink drain is 45 years old and the fittings don't seem to be the same as all the illustrations show. Anyone can give simplistic advice, but good and thorough advice is scarce!