A 3-step illustration

I require an illustration for a business proposal that I am working on. This job is quite urgent. Ideally, I would like to have the completed illustration in the next day or two. The illustration must convey a business idea simply and clearly. The 3-step illustration should show: 1. A school secretary using a computer. (The "name" of the computer system the secretary is using must be obvious/clear on the screen.) 2. The secretary sends an email/SMS notification from her computer screen. 3. The recipient of the email/SMS uses his/her smartphone (and credit card) to pay a bill. If you are interested in this job please let me know the cost. I will give a little more detail to add to the drawing later. Note that the illustrations do not need to be very detailed (with shading, etc). The important thing is that they convey a message quickly to the reader.