1985 Buick Riviera won't start

I have a 1985 Buick Riviera and I went out to start it and it wouldn't start even with a jump. Changed the spark plugs and tried to start it and it wouldn't start even with a jump. It tried to start the first time but wouldn't after changing the plugs and tried to jump it and it wouldn't start. What next

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Does the moter try to turn over? Does it have compression? Do the spark plug have any spark (you could unscrew a spark plug leave it connected to the wire and look when you try to start the car off you have a spark)?

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