I'm very familiar with Inter on FM. I'm a die hard supporter of the club and here is my quick review.
Get a central defender in season 2. Samuel, Matereazzi, Burdisso and Cordoba(and Chivu) are more than enough. You should look to offload Materazzi in the second season, and probably a good offer will come for Burdisso and you could sell him to get a better starting defender.
Maicon and Maxwell are amazing, and both your goalies are very good.
If you play 8.02, then buy yourself a good striker, someone like Huntelaar or go for Villa if the board gives you more money. You could sell Adriano(who is on loan at Sao Paolo) in season 2. Ibrahimovic is a top player, Suazo and Cruz are quite effective and Crespo is good for rotation. But you'll need a good starter as well..
As far as the midfield is concerned, you have Cambiasso, Vieira, Zanetti and Stankovic who are starting material, and also Figo, Maniche(if you are on 8.02). Solari and Cesar are bad players so sell them.
You should look to go for Alessandro Rosina from Torino or Riccardo Montolivo from Fiorentina, but your team is good enough for one season. You can also get Nani, Aguero or van der Vaart in the second season.
All in all, your team does not need much improvement from day one, but the team is quite ageing, so if you want to continue for a long run game, opt for some of Huntelaar, Rosina, Barzagli, Montolivo, Aquilani, Aguero, Nani, Quaresma etc..
I usually win all trophies with Inter using similar strategies