Have I spelt the words in bold correctly for their intended context?

As some of you probably know, I’m trying to improve my English spelling and grammar. Below are a few phrases, each with a word or so in bold. I am curious to know if i have spelt those words correctly, and used them in the proper context.

1. Me and my friends wear gloves.
2. We were all happy yesterday, but not today.
3. I tried to sell him some of my wears/wares?.
4. We had no idea where we had ended up.
5.The car was wearing out.
6. I use the keyboard to type.
7. It was a type of monster.
8. the weather was terrible.
9. I did not know whether i was coming or going.
10. the armour had become weathered.

Furthermore, I have a couple of bonus questions, here they are:

When do I use stops and full stops?—All I have ever been told regarding stops and full stops, was about their usage in Castillian Spanish, and even then I was not really paying attention in school that day. This is how I understand it: A comma is used almost whenever you like, It’s basically there to let you create little pauses. As for stops, they go at the end of a sentence or the end of a paragraph, and their pause is longer than that of a comma. Also, stops go at the end of thoughts or when your point has been made.

When is this ”;” symbol used?

Am I mistaken in thinking you can’t use the words And or But at the beginning of a sentence?

Thanks.