You're certainly on the right track to check the spark. Don't be surprised if you eventually have to change the ignition switch, I seem to have terrible luck with them. Once you get it sparking, then you can rule out other things like fuel or even low compression. Get some spark and then report back. If the battery is bad get a new one--strongest thing that will fit. If the plugs look ancient or gunked up, I'd get new ones, only cost about $5-6 for the pair.
Glad you are getting it back going.
