-6 qts of 5w-20 oil and FL-820S filter at Wal-Mart is $21
-Autolite spark plugs are $3/plug
-3 qts of Mercon V for the trans (manual) is $4-$5/qt (much more for auto)
-Air filter... I honestly have not bought a paper filter for a stang in forever, figure $20?
-Cables... I'm assuming you mean spark plug wires... you don't have any. You have what is called a "COP" (coil over plug) and this is where it gets expensive. $45ish PER COP for the Motorcraft ones which are the ONLY ones you should ever buy. You don't necessarily need them though but if the miles are very high its only a matter of time before they start failing one by one.
You should also do the rear end fluid while you are at it, 75w-140 is what goes in the rear and its very pricey at $20 per bottle IIRC but if its the stock fluid from 00 its very likely laquer by now and should be drained/filled and don't forget the friction modifier.
2000 Mustang GT Steeda #0048 34k miles. 99 Cobra 4V swapped, FTBR IRS swapped, exhaust, tuned by James Gordon.
Just because I give you advice, doesn't mean I know more than you. Its just means I've done more stupid ****.