How do I Become a Projects/Cost Engineer? I am a Fresh Graduate

I am a fresh graduate of Petroleum Engineering from Nigeria. I however desire a career path in Projects/Cost Engineering. All I have is the desire, I don't have the requisite knowledge of what to do and what not to do. Hence, I am in search of answers for my questions below:

1). What are the early steps I should consider

2). What are the professional certifications available for a starter like me

3). Is a ProjectPlannet a globally recognized institution to provide globally relevant training and certifications for Projects/Cost Engineering?

4). I know of AACE. How is ProjectPlannet different from AACE

5). How best to achieve my career goal.

I will appreciate swift and experienced responses.

Thanks,

Moses.