G'Day and welcome,
As Musky says check plugs and fuel, both easily accomplished with limited tools and know how, you will also find a thread on the best/preferred books for maintaining and working on these machines. Hopefully something simple.
I had a very similar issue when I first bought my "newly restored" machine, after much kicking I got it started and rode it home slowly (first gear up hills), seemed ok but not great...
I discovered fairly quickly that my "rebuilt" magneto had the original bearings and no spacers fitted, result, good smooth idle and revs without load but major break down under load and hard to start. I ended up needing to complete a top end rebuild, new rings, honed bore, rebuilt magneto, replacement oil pump, rebuilt carby, fuel and oil tank clean etc and 7 months all that on a fully restored bike?. Lesson, never trust P.O's work, buy a workshop manual and check for yourself, from what I've read on here there are Masters helping on this site that could build one of these machines from scratch in their backyards; and kitchens...