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When looking at the bricks in breakout, it makes sense to see them as an array, which are a very simple concept in assembly, as it is just a contiguous chunk in memory. That said, when initializing our block field, we are just initializing an area in memory with specific values to access later on.
When looking to initialize our memory, we have to consider everything we may use for our blocks, which may be just an xpos, ypos, and active flag, and give enough space to hold everything. There are multiple ways of going about this depending to the constraints you have; if you are looking for space efficiency, you may want to pack your data into one word each, then decoding later when we need to use it; if you are looking for ease of use, you may just want to give each attribute its own word in memory. To take the latter approach, you will want to initialize each attribute based on a starting position, then move that starting position along to affect each block. This may look like

_init:
mov R0, 0x00000000 ; memaddr
mov R1, 1          ; activeflag
mov R2, 0          ; xpos
mov R3, 0          ; ypos
_brickinitloop
mov  [R0],   R1
mov  [R0+1], R2 
mov  [R0+2], R3
iadd R0,     3
iadd R2,     BlockWidth
; add some sort of break condition
jmp  _brickinitloop