Hi Sunitha,
This sort of question has been asked over and over again here in SCN. Please search before posting question. A very naive search here brought me *lots* of results :
http://scn.sap.com/search.jspa?peopleEnabled=true&q=start+learn+hana&Submit=Search
** EDIT **
Regarding the difference between WebIDE and Studio modeling guides: it is basically the same concept on different front-ends. As of now Studio has more flexibility than WebIDE. For instance you can't create attribute views on WebIDE while Studio allows you to use the whole modeling features stack. This will surely change over time and Web IDE will become more and more powerful.
BRs,
Lucas de Oliveira