I want to be fucked by a T girl with a large one, at least a bit larger than me. I am very average. But I know from strap on play with a girl that I have a very tight anus. We had to get a very thin strap on for her to pentrate me. But once she did it felt amazing. I guess the way to prepare is to slowly work up in size with toys? Any other exercises that help with this?

Bend at the waist while holding both ankles...review yr tax returns for the last 3 yrs.
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there's no such thing as too much lube! Everyone has their preference ( I like to use silicone when I top) But bringing, or having your preferred lube is best.
 I don't have the link on my bookmarks. But Google "anal sex tips men" there a few good sites with a wealth of info!

This topic as been asked about many times. You can use any combination of search terms going back a total of 999 days to find the results most helpful. One member who sometimes posts here who is knowledgeable about the topic is TS Rachel, so that might be a search term you could utilize in your knowledge quest.

Who are the other "power top" TS's in LA?

I've seen this question before and all the advice.  
I let the lady stretch me with her tool. It felt great and would recommend it.