[A little help with blender]

Hi everyone !!!
Im new here and i have some questions about creating objects.
I have already made tons of plants/animals with blender for others free games and now i want to use some of them here, but i have not understand some things in the tutorials. (anyway is my first time exporting to .dae)
First, i want to upload some of my plants but i dont know if there are some kind of limit for vertex or how can i make them move with the wind (the other game use a fx_wind vertex group but i dont know if it works here).
Second, i want to know if i can upload object with parts which uses diferent textures.
Also i want to know how can i acces to Aditi because i haven't find anything like a request for that in "submit a ticket".

Here is the first plant i want to try: Monkey Puzzle Tree (Araucaria Araucana)


Thanks