I'm not very well versed with Bitcoin mining with an ASIC like the Antminer S9. I would think you create accounts on the mining pools you're going to use. Then in your pool's account you'll likely find information how to connect your miner or mining software (it should be something like a so-called stratum address). The pool gives you a stratum address where the miner or mining software that utilizes your S9 gets its work jobs and reports hash work back to the pool.
You will need a Bitcoin wallet from which you take a receiving address for your payouts. Anywhere in your pool account, your miner or your mining software this public address needs to be setup. (When I was mining with graphic cards in 2011 the mining pool used the receiving Bitcoin address as account name with an arbitrarily chosen "password", the password wasn't important, an so the pool knew what coins to account for which worker.)
You might want to hop to the
Mining board and read around there. You'll likely get better answers there than here in the Beginners section.