You can use the apex launcher app which I use personally and found it pretty good. It will change the home screen, let you lock your apps and even backup/restore your data.
Go to Settings > Backup and Reset > Factory Reset
Open the contacts of your old device and export all the contacts to the SD card or the phone memory into a .vcf file. Transfer this vcf file in the Eluga Ray Max and just open it. All contacts will be transferred and copied into the Eluga Ray Max
Visit the Play store and search for WhatsApp Messenger. One you find it, open it and tap on install.
Note 1: You can directly sync contacts to Gmail on your Android phone. Follow:
Log into Gmail.
Select and Import Contacts to Gmail.
Choose an Action to Perform.
Select Contacts to Import.
Change Contact Settings.