NBA Star Chris Paul -- BATTLE PLANS DRAWN ... After Becoming Players Union Prez

Los Angeles Clippers' superstar Chris Paul hasn't even been President of the Players Union for a full 24 hours yet -- but he's already put together a list of players' demands to take to the NBA, TMZ has learned.

Paul edged out veteran shooter Roger Mason and others to take the position -- and NBA sources tell us the players went with CP3 because they feel he's got the cojones and the clout to effectively take on the league.

Sources tell us ... Paul is taking his new role very seriously -- and is already talking to players about his agenda, which includes:

-- Preparing a battle plan to fight any league proposal for HGH testing
-- Eliminating flopping fines
-- Forbidding any dress code additions/changes