I play with them.About team,i play 4-2-3-1(2 dmc,2 wingers,1 adv.playmaker,and poacher).From default squad you can use:
GK - Aranzubia
DR- Laureano(on this position Manuel Pablo is good backup player)
DL- Evaldo(play great for one seasone on loan)
DC- Marchena is your first option(all others players on this position is not good).
DMC- Alex Sandro is just machine.On this position you can use both Alex Bergantinos or Aguilar.
AMC- Valeron is amazing regardless of his age(advanced playmaker),for cover you have Juan Dominguez(i think that is from Deportivo youth system-keep him).
AMRL- Pizzi,Salomao,Bruno Gama.
FC- Rikki(poacher)-regardless of his year in his first season he made 27 goals and was third scorer of the league.
Your main objective is to bring the player on a DC and AMRL position.
I recommend you J.Mensah(DC-free),R.Drenthe(AML-free),S.Strandberg(Rosenborg-DC/DMC fo 1 milion Euro),Sergi Gomez(DC-Barcelona-160.000 euros)
On half seasone you can sing for free V.Weisse(AMR),Mate Simao(DMC).Then you must look on player who play on DRL position.You can bring them in second seasone.
Playing with them is great challenge.
I hope I helped you a bit about some things.