PDF Editor for Mac / Ipad

[SoSolid]

I work for a small maintenance company and we are looking to scrap our paper job sheets and move over to iPads. Other companies in our industry use a similar system, however, I am after some advice on how we can create / edit pdf on an Ipad or Macbook. I want to be able to create a service report in pdf form which then engineers can then fill in electronically and finally get the customer to sign.