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If this is a brick wall, it'd be a major pain to manually paint all of the mortar lines, so your best bet is to prime white, then never touch them again. If you wanted black lines, instead (less stereotypical, but not uncommon), a wash at a later point will suffice, if you don't slather it over your already painted brick faces. I like to sponge on the next coat - better coverage than drybrushing, but still keeps paint off of the recessed lines - with the final highlight applied by light drybrushing. If the bricks aren't assembled, you can just paint on the first coat, then drybrush the highlight.
As for colors, it depends on the feel you're going for. For something more vivid and cartoonish, I use a moderately deep red (Mechrite Red foundation paint), darkened slightly with a dark brown (Scorched Brown), using the pure color as a highlight. For a more faded look, I'll mix red with a decent bit of a warm medium brown (Bestial Brown), adding more of the brown to the highlight. If I want the weathering to have a grimier feel (wetter, sootier, etc.), I'd use a darker brown (Scorched Brown, again), but in greater proportion than the first method.
Also, remember that bricks are rarely entirely uniform. Especially if you're doing an assembled wall, it pays to lighten or darken a few bricks, here and there. It looks haphazard if you overdo it, but keep it subtle and it adds a nice touch of variety and realism to simulated brickwork.
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