For information at Susan's Place (
Susan's Place Transgender Resources — We stand at the crossroads of gender balanced on the sharp edge of a knife.) has always been good but I'd avoid the forums. They have some funny ideas about what's acceptable and what's not. I got my butt chewed out for saying I'm transgendered. They told me that word is extremely offensive.
For forums I used to go to crossdressers.com but 10 years ago things started turning into a war. Too many people were intolerant of the other groups. More than some is too many in my book. The transexuals thought the crossdressers were playing dress up. The crossdressers thought the transexuals were drama kings and queens. Everybody wished the rest of us would just up and die already. I haven't been back since.
I love Crossdresser Heaven (
Crossdresser Heaven – Discover your woman inside!). It's great. If you were born male that is. I just looked at default profile pictures (avatars) and there isn't a single male picture in the lot. Too many of the members (and again some is too many) tend to run roughshod over the GGs. Most of the replies in the Dear Genetic Girls forum are from the crosdressers. The pink fog there is more like pink volcanic gas.
There's a link there to Transgender Heaven (transgenderheaven.com), which is for transexuals. Since I'm not a transexual myself I can't really tell you what the forums are like. I recognize a member from CDH on TH. I'll ask her opinion of the site with respect to transmen. looking at the Introductions forum there are male avatars (at least the default one) and I found a post from at least one transman. It might be worth checking out. I'll still ask that member's opinion even just for my own knowledge.
I know this isn't much help but hopefully It's a starting place at least.