First step is get a manual.
Second is read the manual
Third is get tools, almost anything you could need is in the OEM tool kit, but they are not that great
Go through the bike with the manual, it will walk you step by step through tuning the bike up and the correct order to do things
Remove most ideas of "building" anything. Just keep the bike running for a while and learn. Dont go looking for work, a 40 year old bike will always give you something to mend
Just because something worked the other day doesnt mean much, my uncle was alive....right before he died...
Learn what good and bad gas look/smell like. Not the whole turning to varnish after a million years thing. Im talking about the ethanol separation. Read up on that, gas is only good for two weeks per the makers.
Go over the points, this is not a black art or the mystery of the universe. Its rather simple and something you will have to get down in order to keep the bike going
Find a chart that shows rich and lean spark plugs
Fuel in the bowls is only a third of the carb, if you look around there is a great manual on the theory of carbs from honda, great read
Dont change things until you get the bike down stock. this means no pods. If you cant keep a bike going stock you will lose the help of the manual by changing things.
Check the wires from the coil for cracks
if checking compression use GOOD tools, this means no harbor freight. most auto stores will rent/loan you a gauge. But really you want to do a leak down test as this tells you more