Treat this as a starting point rather than a closed room. Curiosity about Belize usually comes with curiosity about Central America more broadly, and Honduras or El Salvador are never more than a skip away once you get going.
You will not need a translation app for Belize. English is the working language, and the only real adjustment is tuning your ear to an unfamiliar accent for the first minute or two.
Time zones do most of the work in deciding who is awake. Belize runs on UTC−6, so its 9pm is 7pm in Los Angeles and 4am in Lagos, and evenings are when conversations stretch past the first question.
Nothing at all. Random matching, video, voice and text are open to everyone in Belize, whether the conversation runs in English or English, and there is no trial that expires or premium tier holding back the useful parts.
Signing up is not part of it. Anyone in Belize can open the page and chat anonymously in English or English; the age confirmation is the only box to tick, and nothing you type becomes an account.
Belize uses English day to day, so the language question mostly disappears. Accents shift noticeably around Central America, and asking someone to repeat a phrase is a decent conversation starter rather than an embarrassment.
Aim for the evening in Belize. At UTC−6, 9pm local converts to 7pm for anyone in Los Angeles and 4am in Lagos, which catches people winding down rather than heading out.