Need interactive forms in pdf, and be able to collect data

Hi
I have made an e zine in pdf format. I need to add comment section in it and be able to collect data.

I have been googling, there are programs to make interactive forms,I have made them too online, but

1. i am not able to append to my pdf file

2. The comment is not posted to me, just sits there, which is of no use. cant find any help file to do so too.

my question is

1. is there a freeware to do this?

2. If not, which is the best pdf editor i should buy?

Thanks in advance.