Honest Answers Needed - Flash 5.0 vs. Upgrading

Thanks for the moment to share,

I purchased the creative suit of CS5 Web master version, and I am now ready to learn Flash now some 6 years late. My pain is that I am not as persistent with learning flash as to stay on top of the purchasing of updates; if I were given the opportunity I would stay with Flash 5 and learn it; I do have questions...

1.) Will Flash 5.0 work on current MAC Op's in any functional way and where do I learn about that. . .

2.) If there is compatibility then how long would that compatibility last in estimation for 5.0

3.) Is 5.0 a good foundational program to learn from to bride to updates in the future?

4.) What are the major differences with the current Pro verses 5.0

5.) I am moderate in use of Adobe products, would staying at 5.0 be detrimental to future production?

I am of the line of reason that foundation builds and lasts if it's sure, the evolution of products, rightly divided, should eliminate the weeds.

If the the above are answered a certain way I suppose I would learn flash 5.0; if not I may not support Adobe's pace. A good patient answers wins as a valid answer to my lingering interest in Adobe. In general I value all the good effort and years of incredible ingenuity, it's just that I find that production of new tools can some what be a frantic pace for those who want a gentler enjoyment of the quality of these products. $29.00 a month is somewhat a slap in the face if I paid out over $1200 for 5.0 just six years ago. I suppose we all have own perspective, for me, snails can be pretty cool, but I do enjoy email, that hasn't changed to much.

Look forward to answers even if they are a little less than pro.