As sand can be used for beardies, it's a big no for babies. If they eat the sand, they can get impact ion, which can be fatal. I would suggest paper towel, reptile carpet, or a reptile sand mat. I have two adult dragons and my enclosures have half sand and half fake grass. The grass is wonderful, but it's difficult to clean when they poop on it. It often needs to be scrubbed. If you don't mind cleaning after your dragon and want good looks, I would suggest the fake grass. You can get it from your local hardware.
You want to remember the environment of non-captive bearded dragons. Keep in mind that they are from Australia and enjoy a desert theme. You can buy a 2D background from some pet shops that have a desert, you could even look online. There are also 3D Rock backgrounds you can buy, which are more commonly found than a desert background.
You will need a basking spot for your beardie. Pet stores supply many fake rocks which are safe for dragons. The rock will need to be close to the heat lamp, but not too close where your dragon can jump and touch it. Ouch. You can also look around outside for one, but be sure to boil it in water for at least 15 minutes, or bake it in the oven for 15 minutes on 200 degrees Celsius (300 Fahrenheit). This is to ensure your bearded dragon doesn't get any unwanted parasites or other things that can be found in the rock. The same goes for sticks, however I recommend not baking the sticks as they can catch on fire. Boiling them for the same time as a rock will work.
Your dragon will need a hide. The hide must be large enough for him to get into. It is very hard to find a suitable hide object outside, so it would be best to get one from a pet store. You can also get a cardboard box and cut a hole in it, but don't put it too close to the heat light.
Your new dragon would love some ornaments like plants. Plants from outside can be collected and used, but there is a very broad range of plants that are poisonous to bearded dragons, and you don't want to mistakenly use one that is poisonous. Therefore, I highly recommend just buying some from the pet store.
You will need a food and water bowl, they can be purchased from the pet store. You will also need to purchase two thermometer to confirm that the temperature that your thermostat is creating is correct. You will need one thermometer for each side, one for the warm side and one for the cool side. I assume you already know that you need a
UVB light, a heat light, and a thermostat. If you're looking for some more ornaments, you can use ones made for fish tanks. I also would recommend getting a reptile hammock, beardies love those.
Okay, I think that's all! If you have anymore questions, feel free to ask! Have fun with your new beardie!