Does the soul get another body immediately ?
If yes, what is the purpose of doing sradha ceremony ?
If not how long do they live without a material body ?

Is there something called Pithru loka ? Who lives there ?

Is this subject discussed in any puranic literature ? If yes, any online version of this book available.

Sorry about the number of questions.

I am sure VEDA Prabhu has answers for all these questions.