When starting something new and you want to document the journey on social media, the first advice I give is to
USE WHAT YOU ALREADY LOVE!
Whether it's an epic trip, life change, a new endeavor, a new hobby, personal journey, business, etc. documenting it on social media preserves the record, gives you feedback you may or may not want, and can help to keep you motivated.
If you love Facebook, make a Facebook page for the journey. Every other social media you use can be shared/linked to that page. A page protects your personal profile from unwanted inquiries and can reach more people beyond your personal friends list. It also gives demographics, reach counts, busy times and a whole host of other info you may never need but will surprise you.
If you love Instagram, use Instagram. If you love Twitter, use Twitter. If you spend hours on YouTube and videos is the way you want to go, use YouTube.
USE WHAT YOU ALREADY USE AND LOVE.
If you want to expand to a blog or website or other social medias, consult one of your many friends for advice (and/or hire). Invite them to a home cooked meal, show them how much you love them, and remember to give them credit for the help... or hire me (no dinner needed; appreciated but not needed.)
loves SIMPLE. No complications, no extra, unnecessary steps... just easy and most of all, FUN.