Hi "Sachinjava javasachin",
Welcome to JavaRanch! This is a very friendly forum. but the moderators do have some policies Please view the NamingPolicy of our forum and kindly adjust the display name.
Regarding your Question, Building Mobile software will be quite interesting once you are strong in CoreJava. I am also exploring J2ME for the past few days.
You need to download WirelessToolkit from Sun micorsystems for executing the J2ME applications.
Then start doing some Helloworld Apps using the MIDlets then keep on exploring those.
Thanks and again welcome to Ranchers forum,
dinesh.