I've never had AA. Which version should I use?

I never had Acrobat Adobe on my cpu. I have a Macbook running10.7.5 version. The current pricing on AA 11 Is WAYYYYY too much.

Are there earlier version I can get and pay for?

Or if I get a subscription rate, Can I fix my current forms into PDF and quit the subscription when I am done?

Would I keep my forms in the PDF format I have created or will 'lose them'?