Faraaidh and Sunnats of ghusal

Q: I made gusal to become free of janabah. I made my ghusal washed properly but once gusal was over I dressed, done a few other things and then realised that something was in my tooth but it seems it was there before I made ghusal. I used a tooth brush while in ghusal but found nothing. This dirt was found in a deep whole of my tooth. What is the procedure if something is stuck on the side of my toe nail. What should I do and is my ghusal made?

Q: Three or four days after taking ghusl, when one is about to take shower, ones sees a tiny iron dust grain on his thigh. Must he consider this came on his thigh after the ghusl?

Q: Is it Sunnah Muakkadah or Sunnah ghair Muakkadah to perform ghusal on a Friday?

Q: I should not take the water inside my nose during wadhu or ghusal due to health problems. Is this acceptable in Islam?

Q: I was always thought Ghusl is performed in the following manner. First you must clean the area that is napaak. Then you gargle. Then you clean your nose. And then you wash your entire body thoroughly such that no hair on your body is dry. Are these steps correct?

Q: 

1. Is the plaque (white dirt) that accumalates on the teeth neccesary to remove and the wax on the ears for Ghusl to be done?
2. Till which portion of the mouth is it Fardh to wash for Ghusl to be done? 
3. Dirt stuck in between the teeth without removing them, will the Ghusl be valid?

Maaf for the Takleef, I always had doubts regaarding this, resulting in me spending lot of time doing one Ghusl.

Q: If during gusul e janabat I have something in my tooth cavities that can't be got rid off easily, will it make my fard of washing the mouth incomplete? Is the filling of the mouth fully with water fard or washing the teeth as well? What if I have my teeth filled medically (ionic filling)?

Q: Please can  you tell me am I making ghusal right as I was thought this way in school.

1. Make niyyah
2. Wash private parts
3. Wash hands
4. Make complete wudu
5. Pour water over entire body 3 times.

I have been told this is incorrect. An is it the same for males?

Q: I got married 4 months ago and mistakenly I used the word nifaz instead of janaba while doing bath after monthly periods and was reading namaz and also quran daily. Do I have to give kaffara or I did a big mistake and your advice is appreciated. Please help I am in much dilemma.

Q: When I made fard ghusl couple of days ago I can't remmember if my beard hairs got wet. If not I've got a flat beard what should I do?