I would recommend the quads more so than the glutes. Yeah, delts when more experienced with the procedure.
A lot have great luck with deca though I have not tried it myself.
My first (real) cycle included:
weeks 1-4 35 mgs d-bol ED
weeks 1-8 500 mgs enanthate EW
weeks 1-8 400 mgs EQ EW
It worked well for me.
Personally, at 15% bf I'd probably do a Prop and tren cycle myself. Some say beginers shouldn't do tren though, I don't see why not.
So if you haven't already purchased your gear you might consider:
100 mgs of test prop ED weeks 1-10 or 12
75 mgs of tren ED weeks 1-8 or 10
50 mgs winny ED weeks 4-10 or 6-12
I gave some options open for you on length. Also, if you don't want to stick yourself ED just do 200mgs prop/ 150 tren EOD.
Since you're new to juicing, I would wager that you would almost get bulkin-type results (in terms of muscle gain) with the propper diet. At 15% bf you don't need to look even more soft IMHO.