18 is way too young bro...at your age you should be able to make fantastic gains naturally. Be smart and try to avoid the temptation for a few more years...I promise if you do this then when you are ready for AAS use it will be far more worth it.
As for running dbol alone and nothing else, if you stay around this board long enough then you will understand that this type of cycle is a total waste. Sure, you'd put some size on and gain a bit of strength, but a cycle like this will be imposable to keep any gains made.