There's a special sound, /-n/, that deserves mention. Whenever you see the letter "n", but it's not followed immediately by another vowel or the letter "y", then it's the special /-n/. For example:
* san "three"
* nihon "Japan"
* shinbun "newspaper"
* sensei "teacher"
* tennō "emperor"
This /-n/ is called the moraic nasal.
The pronunciation of /-n/ changes with environment. So it could be pronounced as "m", or "n", or "ng", depending on what sound comes after. The rules get complicated, so just stick with either "ng" or "n" for now.
Approximate sound / Situation / Note
n / d, t
m / b, p / shinbun → shimbun
Sometimes we want the capital N rather than the regular consonant n even though the next sound is a vowel or a "y". To show this, we use the apostrophe:
kin'en (ki-n-e-n) no smoking vs. kinen (ki-ne-n) souvenir.
hon'ya - bookstore
The apostrophes shows that the words should be read as kiNeN and hoNya, not kineN and honya (which you would normally expect, because the "n" is followed by a vowel or the "y" sound).