Frank, the first thing you should do is get a compression test done if you are in a position to do so, just so you have a (very rough) baseline for the engine condition. Once you have done that the next thing I would do is a strip down of the carbs, give it a thorough cleanup (the guys here often refer to dipping the carb, but i've not readily found that kind of product where I am, so did the next best thing of a thorough strip down & soak what i can and then scrub them down with nylon brushes & poke out all the inner plumbing on my carbs with fishing line).
Then a bench sync of the carbs, which is to have them on the bench and make sure they are all starting to open at exactly the same point. Once yo've had that done, then your at a pretty reasonable starting point and may find that not much more is needed to make her easy to start.
Don't forget that each bike is unique and one starting method that may work for your bike may not work for another. I.e. my GS250 likes about half choke and a touch of throttle as she's cranked over, and is always like this when cold. Wheras my RF (ok, so it's a decade and a half newer) likes anything from 1/3 to full choke and doesn't care about it unless she hasn't been turned over in a long time, in which case it's full for the first start and "anything" for each start afterwards until she's sitting unused for a while again.
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