Assalamu Alaikum all

I'm new here and I can't find any questions that is related to "How to be an Imam." Just would like to establish that my question is here for my own setting (and hopefully for other Muslims) and not trying to make it out as if I would be the appointed imam in a masjid "mosque".

Usually in my workplace, I have 3 other Muslim brothers who would pray together and occasionally, I am appointed to be the imam for our congregation of farz (thanks to my brothers who taught me what to do but I am still learning though). I roughly understand how to be an imam but I would just like to clear my doubts on this, therefore I post it here and would like to know if I am doing it the right way so as to please Allah (s.w.t.).

Fajr:

I've only done congregation here once and that was with my grandmother. I became the imam (for obvious reason).

• Should I be doing Iqamat too since there's no other male around?
• After which, I made the niat to be the imam and pray the salah fard of 2 raka'at followed by takbir, "Allahu Akhbar".
• Then I did iftitah followed by Surah Al-Fatihah and Ayatul Kursi (Surah which I use most of the time because I am still having difficulty memorizing the rest...). For the first raka'at, do I read out Surah Al-Fatihah and other surah loudly (example: Al Ikhlas, An Naas, Al Kafiroon)?
• Then I said the takbir and got into ruku' and said "Subhana rabbiyal adheemi wabihamdi" x3, I said this at the normal level of speaking, is this the right way or should it be spoken in my inner thoughts?
• Rightly after I said "Sami Allahu liman hamidah" loudly followed by "rabbana wa lakal hamd". But do I say this loudly too or should I speak it normally or in my inner thoughts? Cause usually it's spoken aloud by the makmum.
• I understand that every sujood ("Subhana rabbiyal ala wabihamdi" x3) and in-between-2-sujood (sitting, Rabbighfirli warhamni wajburni warfa'kni warzuqni wahdini wa'afini wa'kfu 'anni), it's spoken loudly for my own hearing only, is that right to say that or should it be spoken in my inner thoughts?

Dhuhr/Asr:

I've done congregation here plenty of times and occasionally chosen to lead the prayer. Some key things that I am having doubts are:

• Is it right for me to just say the surah for myself for all the rakaats or also recite it for the makmum? I was told to just recite it for myself while the makmum will be reciting for themselves too.
• I am led to believe that I have no other issues on the ruku', sujood, and all the takbir that is in between if the questions I posed during Fajr has been answered. Unless of course it is different from salah Fajr.

Maghrib/Isha':

I have only done Maghrib once and non during Isha'. Do guide me to the correct path.

• Is it right for me to just say the surah for the makmum for the 1st and 2nd rakaats while reciting them for myself on the 3rd and 4th rakaats? I was told today by one of my fellow Muslim brother that he can't hear me reciting and I felt guilty for that hence the reason for me to seek the answers here in islam.stackexchange.com

I guess that's all of my questions for now. Thanks for taking the time to read. Best if you could answer fully and also provide sources on how to be a proper imam for every fardhu.

Jazakallahu khair.