It's extremely tough to pry a 1st rounder from another team and this year is genuinely regarded as a very deep draft from a talent-standpoint so its even more difficult.
Unless you're trading a bonafide cornerstone type in their prime or entering their prime, you're almost never going to get a 1st rounder back. (Unless you're dealing with the Raiders
)
Also regarding picks, The Dallas draft scorecard from the Jimmy Johnson days is still widely regarded and utitlized around the league.