The Tampa Bay Buccaneers are just about set to enter their first phase of the offseason. Rookie minicamp starts on Friday for the Bucs, and we'll finally get a first look at Tampa Bay's newest draft picks and undrafted free agents in a Buccaneers uniform. While there won't be pads and contact will be light, rookie minicamp is still a great first opportunity for many rookies — and for others, the only opportunity — to show the team that picked them what they're made of. Here are three things we'll be looking for when rookie minicamp kicks off: What will Rueben Bain Jr. look like? Miami Hurricanes defensive lineman Rueben Bain Jr. (4) against the Indiana Hoosiers during the College Football Playoff National | Mark J. Rebilas-Imagn Images Tampa Bay's draft war room was ecstatic when edge rusher Rueben Bain fell to them at the No. 15 pick, and they selected him to be a dominant No. 1 pass rusher.…