.... yes.. no point in an early barracks. :icon_cool:
Wow. Barracks is the most important, especially if you have barbs near. Farming can be fast/efficient and pays off. You will have a great army by the time BP ends, as long as you manage your army well.
Market is useless. 99% of players before BP need wood, as its very high in demand. If you scroll throughout the 10 pages of market, trust me, there will be no wood offers. (Trading wood for something.)
Wall, useless. Only upgrade wall once you have good feelings about your building critique and you're ready to go. Most of the time, you should dodge early on (Counter) as you can easily gain back resources. Walls are not needed until BP ends, if you want, upgrade it a few hours before...