First message: how to start respectfully
A first message to a trans woman on Telegram works the same way a first message to anyone else works, with one specific consideration. The general rule is identical: be specific, be brief, show that you have actually read her profile and have something real to say. The specific consideration is that trans women have heard every fetishizing opener a hundred times, so opening with anything that reduces her to her transition status is the fastest way to get muted.
What works. Two short paragraphs maximum. Brief self-introduction with one specific detail about you. A question or observation about her style or content based on something you actually read on her recent posts. A clear statement of what you are looking for, whether that is a casual conversation, a paid session, or an ongoing connection.
What does not work. Opening lines that focus exclusively on her transition. Generic compliments on her appearance only. Demands for content before any conversation has happened. Using template phrases that anyone could send (and that she has seen hundreds of times). The basic rule is respect. Treat the first message like you would write to any professional whose attention you want to earn.