Sorry to hear about your troubles.
First things first - go ahead and jump the top motor like you did and let it run all the way up even if you see some sparks.
That is a rather large load on the battery, and it will spark when you touch the wire to it like that.
If the motor is running and the top is going up, don't worry about the gas tank.
As for the other problems, you have to ask yourself what level you want to get into this.
If you are going to chalk it up as a learning experience and not get in too deep - then you will need to get it towed somewhere.
If you are willing to work through it - it can be done rather easily most of the time.
But you will need to invest in a volt meter. You can get a cheap digital one at any hardware store.
I would get one of those and a package of alligator clip wires.
Then, go here and download the 67 wiring diagram.
Try to do what you said, and return everything to as close to stock as possible.
From the description you gave, you messed up the circuit between the ignition switch and the starter solenoid somehow.
Hopefully, someone will be able to get to you to help, but if not - keep us updated here and we can try to help!