Soul ring recipe first ALWAYS. Better starting items are SR recipe / Tangoes / Sentry wards / 3xBranches. QB is good if you know their lane is weak enough that you can cs and deny, and actually helps immensely once you start poking in and out of jungle. Plus cutting down trees for extra vision (dire side) / secret side shop spot (radiant side) is useful. If the lane is easy for you as brood starting SR recipe / Tangoes / QB / 2xBranches is good. Never start off with Ring of Regen because Tangoes will give you more regen if you actually need it early on and you can buy the ring at the side shop anyway.
I think your skill build on Brood is a bit situational. Generally you will not need to get Ulti at 6, but delaying it should be a conscious decision rather than the normal build. You take ulti whenever you feel like it will help you get a kill or push down a tower, which often comes at lvl 6~8. Your extension items need to include AC and Manta, as those will boost Brood's utility/dps more than MKB or Daedalus.