After you've done the prologue mission at the start of the game go to your plane where you're meant to start the main missions.
At this time you can also start side missions though, by talking to your team.
So talk to Grim and you'll get four side missions to complete. If you complete them all, then you'll get new gear unlocked via the "Customize Gear" option. It is all the stealth gear.
Now you can start the main mission 1 (Safe House).
It it the fastest mission to complete in the game, and if you do it without killing anyone and while remaining undetected, you'll get lots of cash.
Once you've done it like this, in order to simply repeat it (should get easier right?) go back to the plane and find the "SMI Panel" and press A on it. A map is shown and you need to press LB to show all the missions.
Simply replay the Safe House mission perfectly a total of 8 times and you'll have enough cash to buy all of the plane's upgrades and also all Sam Fisher's gear and weapons.
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