Nothing wrong with using heat lamps, they're all I use. I would turn it on and let it run for an hour then check the temp BOTH under the light and at the opposite end of the brooder.
You want to get the Temps right before the chick's go in so you don't have to check on them all night. You want a pretty good temp difference between the two ends of the brooder, like 100f and 80f if possible. Don't worry if it's a little too hot directly under the light (like 105F) as long as the cooler end is significantly cooler they will position themselves where they are most comfortable. I've even had it 110F under the light and stay perfectly comfortable by sleeping at the edge of the light. Too hot is way better than too cold as long as you have enough room in your brooder for them to escape the heat.
I prefer the light over your heat pad for a couple reasons. First if the dishcloth is folded too much they'll be cold. If they squish it down some from walking on it they might get too hot. But the biggest reason is they have to be on top of it to be warm. So the temp of the heating pad needs to be perfect. If it's too hot or too cold the chicks end up too hot or too cold.
This is the benefit of the heat lamp. As long as it's as hot as they need or hotter they will position themselves closer or further away from it where they're comfortable.
You will definitely want some kind of substrate over the glass floor. I use fine pine shavings and it works perfectly. I've seen people use paper towels, towels, and shelf liners over newspaper and they work too.
Most people recommend grinding their food up but you do not need to do that. I used to do that but for the past 400ish quail I've never done it and they have zero problem eating the crumbles as day old chicks.
I always highly recommend getting a quail waterer. They have narrow troughs that the quail can't get inside. Not only can they not drown in it but they cannot stand or poop in it either which makes them more sanitary than chick waterers or bowls with marbles in them.