Since you aren't answering right away, I'll be more specific:
I think you should come out to any liberal people who are supportive of trans people, as long as it would not get back to anyone financially supporting you who is conservative and could stop support.
You could also come out to liberal people who support trans people and say "Please don't post anything online because I have conservative family" if you are on something like Facebook with both friends and conservative family.
If you are financially independent and have savings, yes, come out right away.
Also, if you are suicidal and trans and in a conservative area, I would move to a more liberal area that accepts Trans people. Some cities and states love their trans people and think of them like a special wonderful part of the community. If you can't move right away, don't come out, save up, then move.