That looks good so far. You can use the flower pot as a hide. A young dragon probably won't need much clearance. A couple of inches should do. You can expand the entrance if needed later on. If budget is getting tight, I advise putting the priority on high quality UVB lighting. Get a nice T5 (22'' size is good for most tanks) and fixture w/reflector like this
http://www.lightyourreptiles.com/22-t-5-ho-fixture-high-output-with-arcadia-d3-12-ho-bulb/ It will output excellent basking levels of UVB from about 12'' above the basking area (rock outcrop in this case).
I would also get a couple of digital thermometers w/probes so you can monitor the temps on the basking surface and on the cool side
https://www.amazon.com/dp/B0017N8W90/ or an IR temp gun for spot checks like this
https://www.amazon.com/Nubee-Temperature-Non-contact-Infrared-Thermometer/dp/B00CVHIJDK
For a basking/heat light you can use a PAR38 halogen flood light. The wattage you get will depend on the heat output but I'd start with a 75w and see how that works. You can put them on a dimming thermostat or manual lamp dimmer to fine tune the output if needed but it should get pretty close to proper temperature gradients on it's own. I look for about 100-110 on the basking surface and between about 75-80 or so on the cool side with a nice gradient between.
You may also want to pick up something for the bottom. I suggest something that is solid and easy to clean like non adhesive shelf liner or ceramic tile. Fleece works well too if you want something that is soft and can be thrown in the washer.
