If you have sparks at ALL the plugs, then you do not need to look further at the wires.
You need to tell us if the sound you hear at switch on is a brake servo or the fuel pump priming. If the fuel pump does not run for a second at key on then you will have no fuel.
Did you mess with/unplug the fuel injector plugs when you were changing the spark plugs?
Have you been inside the fuel tank and replaced the fuel filter? You told us you have done some self maintenance. Do you know when the fuel filter was last changed?
Do your gas tank fuel lines have quick disconnects fitted and have you disconnected them and put them back the wrong way around?
Release the gas tank flap then key on and try a restart, just in case you have a blocked vent pipe.
I tend to agree with mrbill that often the last thing you were doing can have some bearing on a new problem that suddenly arises. Is there something in the short list of things you did which you have not mentioned?
If you can go no further then you will either have to let the shop fix it or learn to become a repairer and self maintainer like most of us. To do that you start by buying a Clymer manual and an inexpensive digital multimeter so you can learn your way around the parts on the bike, where they are and what they should do. These are no ordinary motorcycles like the one's they made in the 60's!
Perhaps in diving in to what should be a simple first time job, you mistakenly disturbed something. Without some knowledge and a roadmap of the bike, you could going up blind alleys.
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