new user questions

am a new user to the Adobe Licening model and the needs of our very small State Agency (company) are very simple but am unable to figure out how to proceed .. any help and guidance you can provide would be appreciated .. below identifies some of our needs:

1. Would like to send our tax exempt certificate so no tax will be charged on our purchase ..
2. would like 4 licenses of Acrobat Professional .. the annual price we saw at your web site was $179.88 for each for a total of $719.52 .. but do not know how to initiate this
3. we have a purchase order for this amount and would like to use that for this purchase
4. would like Adobe to bill us annually for our Adobe Acrobat Professional licenses

thank you .. kjw ..