Want to get some balls during BP

I want to catch some balls during BP on Sunday should I go to left field and try catching a ball or go to right field and ask a player (I want 2-3 balls for me and my friends). And how early should I come prior to the game starting my research says Minute Maid park opens 2hrs before a game is that true (my first try trying to get a ball). Or should I wait for a foul ball (I sit in the 417 deck).