Just read the description in the game, it gives a pretty good impression:
Advanced Playmaker: "With a support duty, the advanced playmaker will stay in the hole and look to spray passes to support players and forwards."
"With an attack duty, the advanced playmaker will look to run at the defensive line from deeper positions, aiming to craft out crossing or through ball opportunities as he moves into the final third."
Inside Forward: "With a support duty the inside forward will cut diagonally into the space behind the defence and play through balls or take long shots if the opportunity arises."
"With an attack duty, the inside forward will run directly at the defence with the options of shooting, passing or crossing as he moves into the final third."
Complete Forward: "With a support duty, the complete forward will look to drop into space, run at the defence, take long shots, drive to the flanks or play balls through the defensive line."
"With an attack duty the complete forward will lead the line, spearheading attacks and crafting out chances for himself and others."