From the source rules

Who goes first in 500 Rum?

Bicycle Cards rules, standard 52-card pack (English)

Play begins with the player to the left of the dealer, who draws either from the stock or the discard pile.

Source & edition

All 38 Bicycle Cards (The United States Playing Card Company) starting rules

If there’s a tie

The rulebook doesn’t say.

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More starting rules about the player on the dealer’s left

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