namaskaram sumit ji ,
I know it is tempting to want start sadhana , but I would realy seriously recomend simple chanting , I would definately leave tantra untill you have a guru that will make the recomendation of the right practice for you . I certainly wouldnt suggest tantra without good instruction.
I am not sure that I would go anywhere near telephone gurus ??? a guru needs to know more about you , he needs to see you , observe your reactions and watch your progress , he will then want to talk to you inorder to make sure that your motivation is good before he will think to give diksha .
but you also need to listen to , and watch that guru , you need to be certain that that is the right guru for you . It is the most important relationship in your life so you want to be realy sure ,it is like getting married , it is a commitment for life . if you take the wrong guru it will be very hard to change direction and start allover again . a good guru will stop you from making many mistakes and will guide you all the way , a guru who has too many deciples and canot spend sufficient time with each deciple is not the best kind of guru and a telephone guru he canot spend any time with you , so I would realy worry about this .
you need to meet that preson , only then will you know if he is your guru . telephone contact might be ok once you know that person but otherwise I realy have my doubts .
but realy do not worry your guru will turn up when the time is right , just keep praying , he will come :namaste