If the physician recommended hearing aids, have the vendor submit an autho request to ACS.
The CA-7 probably is for the purpose of obtaining your pay rate for compensation purposes.
I would expect that the next thing that you would receive would be the award notice and the money. It may come as a lump sum or the award may terminate at a future date and be paid out every four weeks. Usually these awards start on the date of the medical examination, so if that exam occurred awhile ago, the odds favor one lump sum payment. If the exam was just last week, the ods favor one retroactive payment and ongoing payments every 28 days until the ending date of the award notice.
With hearing loss involving both ears, usually you get two weeks for every one percent of hearing loss. A 10% binaural hearing loss is 20 weeks. A 20% binaural hearing loss is 40 weeks.
If there is a dramatic difference between the loss of hearing in the ears, then this rule of thumb may not apply. But, probably over 90%+ of hearing loss awards are paid the way described.