Add a self evaluate prep section

[Dedekind561]

What does this change?

Adds blocks to self evaluate prep. Adds a new block to self educate

Checklist

• [x] I have read the contributing guidelines
• [x] I have checked my spelling and grammar with an automated tool
• [x] I have previewed my changes to check the markdown renders as I intend
• [x] I have run my code to check it works
• [x] My changes follow our Style Guide

Who needs to know about this?

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[Dedekind561]

Thanks for your comments and feedback. I've tweaked some of them, merged them into some of my own and added more sections with actions Next steps and In practice. Think it's ready to go out as a first iteration.