Salam alaikum Moulana, what I want to ask is that if I want to know the history of our imams from the basic, could you please refer me to the sources from where I can gather this information.

Walaikumussalam Brother
If you want to read Urdu books then
Chauda Sitaray written by Marhoom Maulana Syed Najmul Hasan Kararvi sb
Or Nuqooshe Ismat written by Marhoom Allama Zeeshan Haider Jawadi sb
Or you can find translation of Biharul Anwar into Urdu language for masumeen as.
Wassalam
Syed Abul Qasim Rizvi