Ohayo Gozaimasu

Nihongo wa amari wakari masen, tasukete, kudosai?

If you'd like to make it a question, it would be like this:

tasukete kuremasuka?

Watashi wa ni-juu-ichi sai desu, soshite watashi no musuko wa nii sai desu.

when you just count number, 21 is ni juu ichi. But, when it goes with a counter suffix like "sai",

the pronunciation changes into ni juu 'issai', which means there's a pause between 'i' and 'sai' :a double consonant.

Watashi no musuko no namae wa Skyler dadesu.
Watashi no tanjoubi wa senkyuuhyakukyuujuuyo nen ichi gatsu nijuukyuu nichi ichisenkyuhyakukyuujuuyon desu.

When we mention your birthday, birth year comes first.

When 29(nijuu kyuu) goes with a suffix 'nichi', that changes into 'nijuu"ku"' nichi.

Skyler no tanjoubi wa nisenjuusan nen kyuu gatsu juukyuu nichi niisenjuusan desu.

9(kyuu)→　9 gatsu (ku gatsu)

 　　　　　→  9 nichi (ku nichi)

I hope this helps you!