Advisor suggested me to typeset my thesis with a software that I don't know I am writing my dissertation and my supervisor recommended me this LaTeX template.

https://bitbucket.org/amiede/classicthesis/wiki/Home

However, I have been using MS-Word all along and don't know LaTeX. What are some approaches I can consider given this situation?
Learn how to use LaTeX.

LaTeX is not hard. If you have any experience programming you'll probably find LaTeX extremely elementary. You can conceivably have issues rendering certain characters or equations, but Google is likely to easily find solutions to that. TeX is also quite powerful as a word processing tool, allowing you to write obscure symbols (for example, \cdot) easily. This doesn't mean LaTeX is better than Word; certainly some things are easier done in Word than TeX. But knowing both means you have an additional weapon in your arsenal, and you'll have a better idea which weapon to deploy given what you intend to write in your dissertation.