I would highly recommend getting a broker who is also a clearing firm member for CME for obvious reasons.
https://www.cmegroup.com/clearing/financial-and-regulatory-surveillance/clearing-firms.html
Secondly, the size you are trading, IOM seat is a must. If you feel like buying a seat is too high of a commitment , then lease a seat. IOS lease goes for 300 tops right now. There is one time 2k fee for joining. Good thing is any respectable broker is able to do the set you up (finds you a lessor an does the most of the paperwork). Fairly straightforward.
Seat is good because you dont have to pay for NFA and Routing fees and you get discount on commissions and exchange fees.
More info can be found on:
https://www.cmegroup.com/company/files/cme-fee-schedule-2020-04-01.pdf
If you can pull more than 10k volume monthly, you can get your commissions down to 10-15 cents without difficulty.
Good luck!