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187 Questions

Salam
As for Wudhu yes and you need to repeat it.
As for Ghusl also yes, but you may be able to make it valid very easily.
So if this dry part is in your left side of the body you can make it wet with the intention of Ghusl and this way your incomplete Ghusl will become complete and valid (The reason is in Ghusl, Muwaalaat i.e. "not creating distance between the components of a task" is not a condition for validity but in Wudhu it is!)
According to Sayyed Khamenei if this dry part is in your right side of the body you have to make it wet and also wash the left side as well because in his viewpoint, the sequence of head and neck then right then left side has to be observed according to obligatory precaution. same is with the head and neck i.e. if the dry part is in your head and neck you have to repeat on right and left part again.
According to Sayyed Sistani, if this dry part is in your right part of the body also you can make it wet with the intention of Ghusl and there is no need to wash the left part afterwards.
But if it's in head and neck then you need to wash the body afterwards.
 

Repeated doubts in Ghusl or Wudhu or Prayers can be from Shaitan to disturb you. That is why Ahlul Bayt (AS) have ordered those who have repeated doubts to ignore such doubt and go ahead with out giving ant attention to the doubt.

Ignoring the repeated doubt will help you to get rid of it.

Wassalam.

Bismihi ta'ala

It is not wajib to immediately do ghusl, and is permissible to postpone, as long as it will be done before the next wajib prayer, or in the case of the month of Ramadhan, before fajr. 

However, it definitely is not a good thing to do, based on our ahadeeth. Hadiths say to do it immediately. Why would one choose to stay in the state of inner impurity? You cannot enter the mosque, recite parts of the Quran, touch the Quran. It is makruh to eat, or drink, or sleep, and all the other things that are makruh. 

Why would one deprive himself/herself of many blessings of being tahir? 

Therefore, best thing is to become accustomed to do ghusl straight away, and always try to be in state of taharah.

And Allah knows best

Therefore, 

Bismihi ta'ala

Ghusl janabah will not become wajib unless there is ejaculation, or penetration.

The amount of penetration is the glans penis, which is the tip or top portion of the penis (called ḥashafah).

If there is penetration, to that extent or more, ghusl janabah becomes wajib upon both husband and wife. 

And Allah knows best.