Question on text-boxes and information

I want to create a page where there is a step by step process to post up content, 1st being the picture, which i asked in my previous Q and 2nd being this one here.
How can i link up the 1st and 2nd page together so only once the first is completed they can move on to the 2nd?
Also, on that 2nd page I want it to essentially have some information on what to write then the text box below where users can fill that in and a submission button so they can progress to the next page.
This is all through the front end by the way.