If you're not sure about it then let your assistant take them and take notes of the reaction yu get from his team talks - good and bad...he might not give the best team talks but you can still learn from that. Team talks are ridiculously important on this series (maybe a little too much). I've scored 3 goals pretty easily after a good team talk and now my team are good I barely get a reaction unless I start with 'I expect to win' pre mtch and 'I am not happy' at half time. But the expression is key...if confidence is high then you can be more assertive. If not, its best to be calm or passionate
op is gonna be more down to individual taste....personally, I prefer to close down any midfield with good shooting, quick attackers who pull of the defenders, wingers and then tight marking on good heading strikers with no pace...