Please checking my sentences~

Hi, everybody
I started making some sentences today. So, I need some help to correct it. Would guys help me?

How to read this word？Please correct the romaji)

Love at first sight
一日ぼわ （ichika howa)

One's first concern
最大の間心事 (sai dai no kanshin ji)

Please correct my sentences.

Are you free?
あなた わ 暇 です か？
お暇 です か？

Are you busy?
あなた わ 忙 です か？
お忙 です か？

This person is my friend.
このかた わ わたし の 友だち です。

Thank you.

midori21 said:

Love at first sight
一日ぼわ （ichika howa).

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It should be
一目ぼれ (hitome bore)
hitome means seeing only once.
horeru means to fall in love.
When combined with another word, h becomes b.
bore is a noun form for the verb horeru.

midori21 said:

One's first concern
最大の間心事 (sai dai no kanshin ji).

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Kanshinji should be 関心事.
最 sai means "the most"
大 dai means "big"
関心事 kanshinji can be either concern or interests.
As for your sentences, first of all, please remember that the particle (topic marker) "wa" should be written は in kana, not わ.

midori21;433516 said:

Are you free?
あなた わ 暇 です か？
お暇 です か？.

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あはたは暇ですか。
お暇ですか。
Both are OK. The latter sounds politer.

midori21;433516 said:

Are you busy?
あなた わ 忙 です か？
お忙 です か？.

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Busy is 忙しい isogashii.
あなたは忙しいですか。
お忙しいですか。
Again, the latter is politer.

midori21 said:

This person is my friend.
このかた わ わたし の 友だち です。.

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この方は私の友だちです。
It is OK except わ.
この方 is very polite, you are paying the honour to "this person".
If you are introducing your friend to your teacher or boss, it's better to use
こちら or この人 or if your friend is in front of the person you are talking to, it is possible to omit either of them, and say
私の友人です。

Thank you very much for correcting my sentences and some useful information. I'll remember it^ ^ Im appreciated it a lot^ ^

Thanks again

midori21 said:

Hi, everybody
I started making some sentences today. So, I need some help to correct it. Would guys help me?
How to read this wordﾂ？Please correct the romanji)
Love at first sight
ﾋ?ｪ窶愿ｺ窶堙壺?堙ｭﾂ ﾂ（ichika howa)
One's first concern
ﾂ催??佚･窶堙固?ﾃ板心ﾅｽ窶 (sai dai no kanshin ji)
Please correct my sentences.
Are you free?
窶堋?窶堙遺?堋ｽﾂ 窶堙ｭﾂ 窶ｰﾃ可 窶堙??堋ｷﾂ 窶堋ｩﾂ？
窶堋ｨ窶ｰﾃ可 窶堙??堋ｷﾂ 窶堋ｩﾂ？
Are you busy?
窶堋?窶堙遺?堋ｽﾂ 窶堙ｭﾂ 窶纏ﾂ 窶堙??堋ｷﾂ 窶堋ｩﾂ？
窶堋ｨ窶纏ﾂ 窶堙??堋ｷﾂ 窶堋ｩﾂ？
This person is my friend.
窶堋ｱ窶堙娯?堋ｩ窶堋ｽﾂ 窶堙ｭﾂ 窶堙ｭ窶堋ｽ窶堋ｵﾂ 窶堙個 窶認窶堋ｾ窶堋ｿﾂ 窶堙??堋ｷﾂ。
Thank you.

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Midori, please consult bunpo notes. I wish you the best of luck in your endeavors. You are already trying to use Kanji with the level of grammar you command. I would endeavor the grammar component first, then worry about Kanji. (Unless you are Chinese or Nikkeijin, that is). At this stage, forget the kanji if you are like me, a complete white guy or lady.