I made numerous mistakes the first time I bulked a couple years ago, but the main one that I think could help you is to go into a recomp instead of a cut right now. If you cut you are going to lose a lot of your gains and trust me that sucks.
Use this link for your calories and macros:
iifym.com/iifym-calculator/
then use like myfitnesspal app or something to track everything.
I am going to be trying my first recomp in January, so I will just tell you my plan and if you like it you can try the same.
Basically I plan to stay at maintenance and every week weight myself on an empty stomach in the morning. If my weight goes up then I will lower my calories by 50. If weight drops or stays the same I will keep the calories the same for the next week. If it drops by more than a pound I will up my calories by 50 the next week
Basically this should allow you to slowly lose fat, but also allow you to hold onto, and hopefully gain, muscle and strength. While cutting would cause you to lose a good amount of all 3.
If you plan to cut I would advise you to try this for 2 months first to help you solidify your muscular and strength gains, then if the recomp is not working for you move into a cut or if it is working for you stick with it.
The main idea is to lose fat with the highest calories possible not just because it is less painful, but because it is better for your goals.
I do not want to sound like I think supplements are number one, but one that I am really interested in trying for recomp is Ursolic acid, I am getting mine from true nutrition. AM just had an article about it and I think it is definitely worth the try if you want to spend around $1 a day on it. There are a few other things I am thinking of trying for recomp purposes just pm if you want me to go into more detail on that.
http://anabolicminds.com/forum/content/effect-ursolic-acid-6179/
Training wise, if you are serious about competing you need to pick between powerlifting or strongman. If it is too hard to choose then train one for 6 months to a year then do a competition for fun, if you enjoy it then stick with it, but if not or you still have this urge to do the other then train it for 6 months to a year then compete in it for fun then you can decide which one you liked more.
To get to the elite level on either you have to have both feet in the water. This is not to say if you choose powerlifting you cannot throw in some strongman training, but remember your main goal and do not let it take away from that. The same goes for the reverse if you were to choose strongman in which for example overhead press would be more important than bench press.