MBD does not have a cure.... sort of at least. It can not be reversed but it can be stopped from progressing further. He'll be like this his whole entire life.
Here are the proper UVB bulbs you need.... hopefull you can get them from these links but if not try to look for these bulbs.
I'd recommend getting the Reptisun T5 HO 10.0 34" with a reflective 34 T5 fixture at the very least and then mounting this inside the tank.
This will allow him to get the proper UVB he needs.
Also make sure the basking spots and everything is low to the ground so he doesn't have to climb up anything too steep. A good way to make places where he can get up high is to get small pieces of tile and just build a little staircase upwards to form a basking spot.
https://www.amazon.com/gp/product/B013RNBXLQ/ref=oh_aui_detailpage_o00_s01?ie=UTF8&psc=1
^ 46" T5 HO Fixture
https://www.amazon.com/Reptile-T5HO-Standard-Fixture-Reflector/dp/B01B209YQC/ref=sr_1_5?s=pet-supplies&ie=UTF8&qid=1523586973&sr=1-5&keywords=t5+ho+fixture
^ 34" T5 HO Fixture
https://www.amazon.com/Zoo-Med-26062-Reptisun-Fluorescent/dp/B00AQU8HKO/ref=pd_bxgy_199_img_2?_encoding=UTF8&pd_rd_i=B00AQU8HKO&pd_rd_r=ZNH52XHETCP3Y7K5FGA2&pd_rd_w=GIi1G&pd_rd_wg=oAEwd&psc=1&refRID=ZNH52XHETCP3Y7K5FGA2&dpID=31QDwNV8eSL&preST=_SY300_QL70_&dpSrc=detail
^ 34" T5 HO 10.0
https://www.amazon.com/ZooMed-Zoo-Med-ReptiSun-Output/dp/B00AQU8HRM/ref=pd_bxgy_201_img_2?_encoding=UTF8&pd_rd_i=B00AQU8HRM&pd_rd_r=R1ZX884J9P08VVS6YN6C&pd_rd_w=l58nu&pd_rd_wg=ZeSJJ&psc=1&refRID=R1ZX884J9P08VVS6YN6C
^ 46" T5 HO 10.0
http://www.lightyourreptiles.com/arcadia-d3-ho-t5-14-uvb-dragon-lamp-34-inch/
^ 34" T5 HO 14%
http://www.lightyourreptiles.com/arcadia-d3-ho-t5-14-uvb-dragon-lamp-46-inch/
^ 46" T5 HO 14%
http://www.lightyourreptiles.com/arcadia-d3-t-5-34-inch-39-watt-12-desert-uvb-the-original-reptile-ho-t5-in-north-america/
^ 34" T5 HO 12%
http://www.lightyourreptiles.com/arcadia-d3-t-5-46-inch-54-watt-12-desert-uvb-in-stock/
^ 46" t5 HO 12%
Heres a feeding guide that should help with how to properly feed him.
However, do note because of his issues he'll need lots of special care now and most of what I have listed below would need adjustments for a beardie with MBD.
All life stages eat 10-20 bugs a feeding.
1-4 months 3x a day.
4-12 months 2x a day.
12-20 months once a day.
20+ months twice a week at the least, every other day at the most.
Staple feeders - Crickets, locusts, grasshoppers, silkworms, black soldier fly larvae, dubia roaches, turkish roaches.
Treat feeders - Waxworms, hornworms, superworms, mealworms, butterworms.
Wax worms - once a week, 4-5 max.
Hornworms - every other day to every two days, 4-6 max.
Mealworms - every other day to every two days, 5-10 max. Only for beardies above 6 months.
Superworms - once or twice a week, 3-4 max. Only for beardies above 12 months.
Butterworms - once or twice a week, 3-4 max.
Daily greens- Turnip/collard/mustard greens, endive, and kale if added to a mixture of the other staple greens mentioned.
Fruit once or twice a week - Banana, strawberries, blueberries, blackberries, red raspberries.
For more food items -
http://www.thebeardeddragon.org/bearded-dragon-diet.php
http://www.beautifuldragons.com/Nutrition.html
Supplementation -
You want two supplements at the very least, a calcium and a multivitamin.
I recommend the Repti-cal brand but zoomed is also good.
The supplements should be lightly dusted on all bugs.
Generally, beardies below two years need calcium 5x a week and multivitamins 2x a week.
However, beardies above two years or at two years of age need calcium only 2-4x a week with multivitamins 1-2x a week.
This does depend on how your beardie is with diet, health, just laid eggs, is laying eggs, etc.