if you are definitely sure you may want to add "ぜったい" or "かならず"... テニスを必ずするつもりです。 "tenisu wo kanarazu suru tsumori desu"

Masked rider

I like the masked rider that the Japanese <strike>say</strike> call "kamen raida-(仮面ライダー)".
Today, I watched <strike>It's</strike><em> </em>the movie in the theater. Then the masked rider <strike>came here</strike> arrived<em>(?)</em>. Many children <strike>are</strike> were <strike>exciting</strike> excited. And during the movie, a child said "がんば !!(Go for it!!)". I thought that <strike>a</strike> child <strike>is</strike> was very cute!
The movie was interesting!

I just want to add, there is no difference in the pronunciation... they sound the same.

First notebook entry: Introducing myself

はじめまして私の名前はキャロルです。私は日本語を習っています。自己研究を通して学んでいます。日本語をマスターする決意が強いです。勉強しているルーチンがあれば、私に手伝ってくれるかもしれませんか？私はカタカナと平仮名を学びました。 私は今漢字のフラッシュカードをつかっています。私の知識を拡大するため、日本語を習っています。よろしくお願いします。

This refers to multiple people travelling in one car... they also will say "High Occupancy Vehicles only" (or HOV). during periods of heavy traffic, they restrict certain lanes to these cars. the term "car pool" specifically means multiple people traveling to one location (usually work or the office) in one car. for example, instead of driving to work in the morning, you would wait for your co-worker to pick you up and then you both would drive to the office.

"Let's get started" sounds the most natural. you can say "let's start" or "let's start now" as well. "Here we go" is a bit more informal, and is something you would say almost to yourself rather than to a group of people. "let's get it started" is actually very informal and has the feeling of teenager talk... it refers to something ("it") which is left unsaid... example: "let's get (the party) started", or "let's get (the dance) started". It can also refer to sexual innuendo.