Create an APP for my business

Looking to have a form we currently use uploaded to either adroid or ipad useage so that we can use out on the field. This form is simple one page that we use to have customer sign when we get to their home. The form is like a receipt. To help save trees and cut on using paper I would like to create same form on my employees phones or use on tablet. We will use each time we go to a customers house. Will be able to input their name,address, date, telephone number, item we are picking up. Will want to be able to have them sign this form on the screen. Then want to be able to either email them or text them a copy of this receipt. I want to be able to have this program installed on any device so my employees can use on their phones or tablet while outside in the field. I can email you a copy of this form. What we really care is that we can have customer sign receipt and be able to send to them a copy via email or text message. If anyone interested or have suggestions on how to do such a task please let me know. Thanks