The Green Bay Packers have welcomed their seven draft choices, collection of undrafted free agents and a handful of players in for a weekend tryout to their rookie orientation camp.   It's far more administrative in design than x's and o's although the players will get on the field for a couple of workouts.  They'll be given the introduction to the Green Bay Packers handbook, including the basics of the offensive and defensive systems with a terminology glossary.   They will also get the Lambeau Field tour, here's the locker room, the weight room, meeting facilities, mess hall, bathrooms, mail box and don't forget to stop by the Atrium for a tour of the Hall of Fame and catch a burger at Curley's Pub.  The camp is really a prelude to the organized team activities which begin next month when the veterans work out.  First round pick Brian Bulaga and the rest of the draft class arrived Thursday but it was Bulaga who was paraded into the media auditorium for a press conference.  You can listen to the highlights and check back on the block for more on the first impressions weekend.