Help with painting my room?

hi. wanted paint room summer , need materials need.

know i'll need paint , paintbrushes. else need? put on wall before , after paint? also, do old paint on wall? it's plain white in color. can paint on it?

thanks.

hi. wanted paint room summer , need materials need. know i'll need paint , paintbrushes. else need? put on wall before , after paint? also, do old paint on wall? it's plain...

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