Setting up Colour and Black and White in one document

I hope this is a stupid question. I am creating the school year book for the first time. It is 80 pages with a mixture of black and white pages and colour pages.

Do I have to set Indesign up any special way so that when it goes to the printers it will know this.

Can I have black and white masters and colour masters in the one document?

Do I need to gray scale all my (black and white images) in Photoshop first?

Do I need to do anything to the text to make it print in Black and white if I am using a black coloured font???

Thank you for your help.............it is greatly appreciated