This is a common thing I hear from Japanese students online. Before they begin to read their speech, they often say, Ok, Let's get started." This always sounds odd to me. It sounds too casual and the wrong situation. If you are the leader of a group of people and your're about to start building something or making something, you might use this phrase.
After the leader explains the tasks to each member, He or she might say;
"Ok, does everyone know what to do? Ok, Let's get started.
In a business situation or meeting or before giving a speech that you wrote, you can simply say,
"Let's begin."or "Let me begin." Use this next time in the lesson to sound more natural.
