STEP 1 CONCEPT
If you feel like you want to Startup that's great ! First you have to find the IDEA the concept, the product, the service that you so deeply passionate about and that you are going to spend the next five years of your life to actually build it nurture it and scale it.
STEP 2 TEAM
Who's going to do that journey with you. Some can do it on their own whom we call them as Solopreneurs. But it's advised to have one or two co-founders to equip your skills and someone who can compliment your skills in terms of experience, technology, Product and distribution.
STEP 3 FUNDING
From whom you are going to raise money? from traditional VCs [family/friends] , Angels or Micro VCs .