HI.

Im starting out unity 3d and I have some questions about textures and models .

1. I tried downloading models for some flowers. It had this .dds file and in one file i could see bits and pieces of the flower (leaves ,stem all seperate and not as a whole plant ) . How do I use this exactly to create the plant ?

2. To draw grass , are png files enough or should i look for some 3dsmax file or something ?

3.I want to draw like some good looking grass with a waving animation so how to do this animation ? Will it be one model file or is it like playing two model files in sequence to give animation ?

Also any links to usable grass/ tree models will be helpful . I know the sites to look for them but I couldnt use anything I found so anything which you know works on unity would be helpful for me to learn the file format and usage.

You need to read the Terrain docs, and the terrain tutorial.

Docs first:http://docs.unity3d.com/Documentation/Manual/Terrains.html

Then the tutorial: http://wiki.unity3d.com/index.php?title=Terrain_tutorial

All this is covered there.