The standard tactic on the game "4-4-2 Standard" is quite a good starting point for a tactic. You'll need to make some changes to it to complement your team and you'll probably enjoy the game more if you do it this way. But if you really want a so called killer tactic search the forums on this site for "killer tatctic" a couple of people have uploaded tactics which other people on this site seem to rate quite highly.
In terms of players Arsenal lack a really quality DM. I'd recommend Senna from Villarreal although for his age he is quite expensive but he is a quality player. If you'r more interested in youth you could go for Francesco Bolzoni in the Inter reserves he'll be a real quality player in a few years.
You also need a right winger i'd recomend Darijo Srna from Shakhtar yours for about £16 Million.
In terms of players Arsenal lack a really quality DM. I'd recommend Senna from Villarreal although for his age he is quite expensive but he is a quality player. If you'r more interested in youth you could go for Francesco Bolzoni in the Inter reserves he'll be a real quality player in a few years.
You also need a right winger i'd recomend Darijo Srna from Shakhtar yours for about £16 Million.

