I’d like to try the trial, but during the trial, are women up to the GOLD level the highest I can make offers to? I assume I can’t make offers to Platinum or Black-level women, right...?

Financially, it sounds like Gold is the highest tier available, but the introduction says you can choose from around 7,000 women. Based on that, it seems like you might be able to make offers to Platinum or Black members as well. In any case, the safest thing is to ask the staff during your interview. And even if they tell you that trial members can’t make offers to Platinum or Black women, there’s nothing wrong with simply saying, “In that case, I’ll pass.”