90,000 book

I'm looking for somebody who can help me to self-publish my non-fiction book of 90,000 words

1 format the text and organise the pages (there is just one image, its all text)
2 self publish on amazon with the relevant bar codes
3 anything else that I should do which I missed out

I have previously self published a book on amazon and so I already have an account on amazon so can put the book on there

I dont really know what is a fair price for this week and so I have put it at £300, message me with what you believe to be accurate.