I suggest getting it really really cold then drinking it handstand style...seriously tho..try getting it to room temp and pitching some champagne or white wine yeast
Check out morebeer and northern brewers extract kits..there pretty cheap and the quality is great...I use them as a on hand beer when all my other stuff is tied up for comp beers
For the espresso,boil it, get it cold and add to secondary..the chocolate you can either melt and pour in or starsan it and toss it in..just make sure whatever gos in there is clean
Generally high gravity, high abv, malt prominent beers improve with time. You can drink them in 6ish weeks..but twice that time will make for a all around better experience