What should I do to become a commercial pilot?
If you plan to train and fly in the US...

You should spend that money on an MSE or MBA, get your private/instrument, and then buy your own plane and fly whenever you want.

However, if you feel you must become a commercial pilot you should find a local flight school and lay out a plan with someone who has authourity to negotiate pricing.

-lay out your objective.  You are paying for a private license, instrument, all of the time building for commercial, and then commercial.  That's a minimum of 250 flight hours plus a lot of billable hours for a very lucky CFI.  You can negotiate an awesome rate if you guarantee the school that business in s short amount of time.

-DO NOT pre-pay more than $1000 at a time.  Keeping funds on account is fine, just don't give them more than you're comfortable losing if suddenly they close.  It happens.

-stick to a schedule.  Fly a lot.  It's cheaper to knock it all out at once.  You have to relearn stuff if you only fly once or twice a week.

-don't get caught up comparing part 61 and part 141 schools.  Just go with the most affordable option.

-research airline minimums.  A commercial cert won't necessarily get you a job.  If fact, a commercial cert means very little wothout hours to go with it.  Think about adding a CFI cert to your shopping list.