Just like the market you enjoy in malaysia or Singapore selling all above you mentioned. Personally, the food may not 100% halal like you see in msia simply because Thailand is not Muslim countries. However I do see one Muslim restaurant at pratunam market at Bangkok.

I understand that it is open every day.

I didn't see proper car parking lots. We simply park in one of the side streets behind Pak Chong market.

Yes, absolutely

I am not very sure but i think there may be some. Suggest that you check booking. Com or expedia, which I used frequently when I travel.

Main road, whatever U're coming from South-West (Bangkok) or North-East (Khorat). So easy to find. In the city when U see traffic jam, just try parking somewhere, then U arrived !