My approach is to first look at his roster to determine possible need and the second thing is to make my best offer with my initial offer, or something close to it. I know there are those that scoff at that and some even like to lowball with the first offer, but over the years I find that avoiding the haggling and possible shut down early, it is best to make your best offer first. I also find this makes future trades easier. Now I'm not above never making a bad offer, but it is rare and usually it is a result of not being accurate with the assessment the other guy has on a player.