That previous comment does not help you at all, its a shame. Anyway if you wish to speak any language with fluency all you have to do is use it everyday, speak with native speakers via skype etc, and practice. Its very simple. It may seem difficult, but you will succeed . All the best.

To merchandise something is to promote so that it can be recognized or become more popular. So in this case the merchandising of the team would refer to making that team more popular/noticeable on an internaitional level (world wide)

The correct statement would be "We sell things like food and drinks"

Although you can make your life easier and just omit "games"

They are both correct.

Both are correct, and when speaking with natives it almost interchangeable no one will call you out on the difference but - "This lesson is easy FOR me [to understand (for example)]. It is for your life, for what you are going to in the future, etc. This lesson is easy TO me. I consider this lesson easy in my opinion

You have to USE the language, by listening and speaking it. The best way is to practice with native speakers. It does not matter how much or how little you know. You will be able to communicate, just have fun with it and do not be afraid to make mistakes. If you speak everyday you will become fluent quickly. Hope this helps.

when someone asks these questions, there is usually a positive or negative response, i.e. the person is fine or not doing so well. For example . "How are you doing - I am fine! thank you."/ "is everything ok? - NO , i had some problems today with my girlfriend" For the last one, yes it is okay to reply "you too" BUT it would some more respectful if you said "Thank you, you too" , you can also say "Thank you"/"Thanks" and other things that you will learn.