ワイシャツ came from "white shirt" ホワイト(白色) shorten to just ワイ.

I answer you what you asked was how you call your friend's parents. The answer is it depends on your age. Young ages, like you, can call them "おじさん" or "おばさん" . There are no diffinite border line, but ages over thirty, we call friend's parents "お父さん" or "お母さん". But I think, you are living in Canada, and you'd like to talk with your neighbors or real friend's parents around you, you can follow your Canadian way. If you usually call them their first name, you can do it. Put -さん after their first name, sounds better. In addition, in Japan, we never call friend's parents first name when we are teenagers. If you do that, everybody say "What?" hahaha. Sorry, I'm not good at English, but I hope this can help you.

猫の手も借りたい

= very busy

 

月とスッポン

= comparing two big different things.

 

How do you like them? Too easy for you?

We use both. 「うち」is for casual talking, like talking with friends.

I think your Japanese is very good, so I'd like to rewrite them to more natural.

 

Bored off or scared away?

もち、いつもじゃないんですけど、日本人と自己紹介ではじめに簡単な挨拶をしたあと、たまに日本人がたちまち静かになってしまうのは、どうしてでしょう。僕、全然分からないよ。僕は普通に、こうゆうふうに言ってるだけなんですが。。

「Hi Naninani-san, if you would like to chat on Skype, my ID is ｘｘｘｘｘ
I look forward to speaking with you!　Brian」。

こんな挨拶のメッセージが、つまらないのか、怖いのかどうか僕には分かりません。もしかして、Skypeでの会話の招待には早すぎなのかなぁ。

If you are talking about tour charter bus, you have many times getting on and off of one group. For first time of getting on time, usual greeting words is enough, I think. Like, "ohayou gozaimasu" (=Good morning) "konnichiwa" (=Good afternoon) "konbanwa" (=Good evening) Also "Boston e youkoso!" (=Welcome to Boston!) Then after above, after they return to your bus from some sightseeing, you can say "okaeri nasai" (=Welcome back) Anyway, if you make mistakes, they appreciate your Japanese words, become closer with you. Don't worry.