When most of your players are 90+, upgrade your scout to 10 and scout in Rest of Europe. 70+ overall players should come up, they will probably cost about £1-3 million. When you have signed them, sell them in the transfer market, they should sell for double or more of what you bought them for.
If you select a rubbish team in Manager Mode, like for example Birmingham, do not go straight into Manager Mode. Instead go into Team Management and click on Club Transfers. Then, get your team, and sell your rubbish players to a team (example Barcelona). Come out of that team and go to the team you put the players in (Barcelona). If you see your players there, then transfer Ronaldinho, Eto'o, Messi, Henry and Deco to your team. Then, go to Manager Mode. I sold Henry and Deco to make £25,000,000 and keep the rest. Also, go tom Team Mangement and select edit player. Go to yoyr team and edit your players, like Ronaldinho, Messi, Eto'o and your GK. There you go, your best team in the world. (I thrashed Derby 13-0 on my first match).
Before you start a season check how much the 'Starting Budget'is on the team you want to coach...if it's too little, go to 'Create Player' and make as many OVRALL 99, Born 1/1/1990, CAMs. Then when in Manager Mode, sell them all, you get from £35,000,000 to £59,999,999 for each of them. Then you can buy loads of stars!
This isn't a "cheat" but it's a glitch. Make your sub like Tevez off but then go down to your striker sub then really quickly when you're at the bottom press down then x and you'll take off tevez and put on your keeper in attack