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I would give it longer. He might be in a different time zone than you are and may be in bed or busy with projects. I would give your client (not employer) 24-48 hours to answer before pinging him/her again.
Note that it is a tactical mistake on your part to ever accept a job offer without having enough information to actually work on the job.
If it is an hourly contract, this doesn't mean that you must have enough information to complete the job. But you need to have enough information that you can do at least ten minutes of work on the job.
With me few years experience on up work, I had learned to always ask the time availability of my client. If you ask, then also communicate your suitable hours for communication. On top of it, always communicate the next meeting schedule. This will put your client in a frame of mind that you are interested and following the client for a good piece of work.