Bro, you really need to stack an AS with an AAS. For this reason, I would suggest the following:
Deca 400mg a week. Inject on Mon and Friday
Test 500mg a week. Inject on Mon and Friday
You can mix the two in the same shot and it will ease the pain. Run the cycle for at least 8 weeks. Two weeks after you last shot start your clomid therapy. Take 50mg of clomid ed for 1 week, then take 100mg ed of clomid for 1 week, then take 50mg of clomid ed for the next weeks. You will be good to go.
Unless you are prone to hairloss, you should be fine and not have any worries. Also make you to have some novaldex before you start you cycle incase of gyno.
I would recc the dbol on the first shot, but its your call. BTW - Taking only Deca, you would not have gained 20lbs of muscle. I ran the cycle above for 12 weeks my first cycle and gained 30lbs, lost 15 due to water and fat. If you can gain 15-20lbs, you are kicking ass bro.
Hope this helps.
P.S. DO a lot of reasearch before you start and make sure you have everything that you need. Make sure to get enough pins etc. You will want a 22 gauge 1 1/2 inch needle. ALso, look up some info on injection tips. MAKE sure to asparate (pull back the plunger after you inject, if you draw blood, pull the needle out and find another spot) If you inject into a vein, you will feel like you are going to die.