Create 12 illustrations for a new book

I have written a book on selling and taking products to market. The title (although that may change) is ‘from one man band to global brand’ – and looks at every aspect of selling and marketing, including social media, to get ahead of the game. It is a serious book, but has plenty of comic moments based on true stories.
I see the typical buyer as being a small company or start up, and I had in mind pencil illustrations. The book will be printed in black and white. I would like the pictures to be modern and reflect the more relaxed ‘apple’ style society we live and work on today.

I see each heading (or step in this case) as having a picture underneath it to summarise the chapter contents, and as much as I can I have given an idea of the type of picture that comes to mind, but I am open to ideas.

Can you let me have a price for all of the illustrations please

Timescale is next couple of weeks

I have attached further details.