L.A.
You are on the right track. I do special events and with that services are thrown in.
If you want to start the business you need to get a tax id with the state of Texas. You may want to consider being bonded when working with peoples money. If you are a CPA that would also help cause lots of elderly need help with lots of different types of taxes, insurance and medical forms.
Make sure if you are driving them around that your auto insurance will cover this you must tell them this is a business, cause it does affect your policy.
Take a home health aid class so that you will know how to assist them in and out of your car. Assist them into and out of wheelchairs and know how to administer CPR. These are all things that I have needed in the past.
I have found most of my clients where through word of mouth. It started with family and then their friends and now I am given references from these people.
This has lead to lots of interesting other services that are needed.