How to apply schema markup types correctly?

Question

Search Engine Optimization

Have a few questions about the introduction of microdata on the site?
Website for lawyer services https://advokat-kuzmin.com.ua. I mark the main one as "LegalService".
1. Can I mark pages with specific services (inheritance, land issues...) as "Service"? Or stick to "LegalService" theme on all pages?
2. If the page with services contains links to additional services (recommended articles) would it be correct to use "isSimilarTo"?
3. If the header and footer on the pages are loaded separately by a script, will Google not swear that there is information in the micro-markup, but it is absent in the html code of the page being marked up.
4. Can I mark up part of the micro-markup directly in the text, and load part of it with a script, as far as it will be correct.
5. Include only the information that is on the page in the micro-markup, or you can supplement it with missing, but mandatory information (such as an address or prices in LegalService).
Thanks in advance to everyone who will respond.