Oficially required formalities such as front page, declaration of independent work, dedication, etc. Must be part of the thesis, must appear in the correct order and must look like EXACTLY like prescribed by the Guidelines for Writing a Master Thesis. The good news is that if you downloaded the official LaTeX template, all these have already been sorted out for you as part of the template. You only have to fill in the blank fields.

Can't believe I'm actually writing this, but make sure you spell your supervisor's name and academic titles correctly. It is only such a little, boring thing, and nobody will be petty enough to actually complain openly, but it does look a wee bit inconsiderate if you misspell your supervisor's name and forget half of his titles or do not bother to look them up at all.

The year of your thesis should be the year of your submission, not the year you set up the LaTeX template :)

The Dedication is usually one paragraph or two paragraphs sitting on an otherwise empty page in the beginning section of your thesis. It is basically a small Oscar Acceptance Speech in which you want to thank all those who helped you through insufferable and horrible pain of sweating out some passable text inspiring and enjoyable process of creating the work of your life. It is usually the most personal (or the only personal) part of your thesis. It is considered good manners to thank your advisor in the first place and then whoever helped you professionally. Also your parents and partner/spouse. You can go ahead with phrases like:

• I would like to (sincerely/wholeheartedly) thank my advisor/parents for his/their … (patience, support, …)
• I am grateful to … for …
• I would like to acknowledge my colleagues …
• Her/his/their patience/valuable feedback/insightful feedback/support/constant support/guidance/valuable guidance/counsel helped me with/guided me through…
• I could not have finished this thesis without …

You get the idea :)