Congratulations on the find a very rare find indeed

I would start by emptying the fuel tank out and rinse with fresh fuel , then get your self a tin of carb cleaner and strip and clean the petcock , next leaving the tank off drain the carbs using the drain screws on the bottom of the float bowls and retighten , refill carbs with carb cleaner and leave over night .
You may want to do this 2 or 3 times the alternative is a full strip down of the carbs and full clean if the carbs are badly gumed up , or you could send them to be ultrasonically cleaned .
I dont think you will need to change plugs at this stage ( with only 169 miles on the clock ) so next i would change engine oil and filter .
Now presuming you have a good battery , new oil + filter , carbs clean and fresh fuel you should be able to fire it up and see how it idles and revs up and see if all is ok .
If all is ok then before you ride it i would change the brake fluid and brake pads , clean and relube chain and a general check that everything works as it should , all lights , check wheel bearings and headstock bearings .
you may find things as you go but this should get you going .