Hi, I am looking forward to start Salesforce Marketing Cloud Next Consultant certification, can somebody please guide me the best way to start and complete this. Any tips/ guidance please??

I would recommend to join community training session. Join trailblaers groups or search which group is starting MC Next training. In this way you'll be able to ask question from speakers as well if you have any. 

The below is already started but recordings are available or you may find others