I want to get a suit. How and where?

Ive never bought a suit before.

I'm looking to get slacks, a black jacket, and a brown jacket.

My price range is between $500 to $1k.

My search has show places like itailor , i think?

How would i go about getting measurements if i order an online suit? I have no idea what my measurements are.

Just buy the tape and measure myself?