People asked me about attributes in PM, so I will post my thoughts on them here. Players and attributes I suggest are mostly for top teams, adjust according to your team strength:
GK: nothing special, best you can get. Focus on shot stopping attributes (Agility, Reflexes, Handling, Positioning).
DC's : I prefer quick, all round players there. FM15 treats slow defenders like **** for me and they perform poor. So:
Acceleration 12+, Pace 11+, Heading 12+ (important because they will win some rebounds on corners and score extra), Vision and Passing 10+ would be great for them to launch counter attacks. Other attributes just for your typical CB, marking tackling positioning etc. Players like Otamendi, Balanta, Bartra, Bonucci will perform great.
DL/DR: Try to get player with high long throw there to exploit set pieces, 14 is minimum if you want your player to teach long flat bullet throw. Other than than, those are your typical full backs, look for Stamina, Workrate, Marking/Tackling/Positioning and Crossing is a plus. I always prefer defensive full backs with high defensive stats to brazilian attacking full backs. Players like Ricardo Rodriguez are awesome, can train bullet throw straigh away and performs even with his lack of quickness. Other players: Cesar Azpilicueta, Lucas Digne, Dani Carvajal.
CM's: Box to Box players, those who can both defend and attack. Marking and Tackling 12+, otherwise you will loose midfield control. Obviously, CML with best long shot, but CMR important too. For further set piece exploit, Long shot 15+, technique 14+, Decisions 10+, Finishing 8+. For open play, work rate, stamina will give you good. I wrote some good PPM's few post back. Players like Pogba, Koke, Lazzari, Yaya Toure, Lampard will do the trick (Lampard not very good physicaly but turned out to be awesome long shooter).
DM: nothing specific, typical ball winner who can help recycle possession. Tackling, Marking, Heading, Positioning, you know it, get the best you can. Kranevitter, Romero, Javi Martinez, Bender brothers, Matic, etc. Defensive ability more important than technical.
AMC: I would suggest you retrain a striker there, someone who is accomplished on AMC, because otherwise really hard to find. Look for Finishing 12+, Composure 12+, Dribling 14+, Acceleration 14+, get some striker like Aguero or Jovetic there. Not a playmaker position, so look for offensive ability first. Gabriel Barbosa, Jovetic, El Shaarawy, James Rodriguez, Aguero, Alexis Sanchez, many players will work.
ST: many combinations possible, but usually I look for small, fast creative striker. Finishing 13+ Composure 13+, Dribbling 12+, Passing 10+, Pace/Acceleration 14+. Luka Jovic, Gabriel Barbosa, Jovetic, Max Kruse, Carlos Tevez, Luciano Vietto.
AML/AMR: If you want further exploit set pieces, look for passing/vision, so you can train PPM looks for a pass rather than attempting to score. First touch 15+, Decisions 14+, so they will quickly pass to CM's to take a shot. Passing 15+ Vision 14+, Technique 14+ so they make accurate pass. Other than that, look you typical attributes for the role you like, winger or IF. Pace and crossing are always great. Players like David Silva, Ozil, Isco, De Bruyne, Cazorla should perform great there.