Sorry everyone for asking such a stupid question, I look all over the internet to find a solution but couldn't find any. i look forward for your reply.
Modelling is nice. Find some tutorials on how to UVW Map. Then find some tutorials on how to texture using textures from places like CGtextures.com Then find some tutorials on how to make your own textures :)
Use whatever you find easy...Thats always depends on the person...If you are familiar with traditional polygonal modeling, and you find it easy, then do that. If you find making highpoly easier, then do that. Its up to you.