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What is the firing order for a 1998 Ford F-150 5.4L and what side of engine odd or even?

The firing order for a 1998 Ford F-150 5.4L Triton V8 engine is 1-5-4-8-6-3-7-2.

As for odd/even cylinder location, it's a bit tricky to definitively say "odd" or "even" side without seeing the engine directly. Ford's Triton V8s have a somewhat irregular cylinder arrangement. However, generally speaking, cylinders 1, 3, 5, and 7 would be considered on one side (the driver's side in most cases, but double check your specific truck), and 2, 4, 6, and 8 on the other (passenger's side). It's best to physically look at your engine to confirm.