hi
5. Language.
I believe that no matter what language you speak, God can hear you. Prayers can be in any language.
Yes, there are two types of prayer in Islam.
1) The prayer we pray 5x a day, it has rituals and it is called the salat. It is in arabic because God revealed the Quran in arabic, and He revealed it in that language because we will gain alot of wisdom by learning such a language.
Keep in mind alot of us don't speak arabic as our mother tongue, alot of us speak english as our first language just like you. But by learning arabic, you actually become alot more wise and cleverer, making you reach new heights. It's such a rich language, and the Quran is in the richest language because it has the most deepest meaning.
2) The personal prayer to God [supplication]. We can pray to God in supplication in whatever language we want. You can ask your personal requests to God in supplication to Him whenever u want. This is called du'a in arabic, and that means to 'call upon' God.
6. The nature of God.
God wants us to enjoy our lives, without us harming ourselves. In short, he lets us do what we want as long as its not very harmful or could kill us. But he knows what's best.
God sends down the best guidance in all aspects of life to lead us to the best way. Whatever He gives us is of benefit to us (even if we can't comprehend it), and whatever He forbids is from is because it is harmful for us.
He knows whats best, and knows us better than we know ourselves. And He gives us guidance to unite mankind upon a set truth.
7. Heaven and Hell.
Hell - If it exists, it is not eternal(for us). God loves us, and does not want us to suffer.
Heaven - For everyone who deserves it, in varying degress of greatness.
God rewards those who believe in Him, and His Messengers (who are humans and servants of God, but the best examples in humanity - which include Noah, Abraham, Moses, Jesus, Muhammad etc). God expects us to believe in these Messengers. He also expects us to follow His final Messenger Muhammad, in what was revealed to him by God.
If we believe in God, the Guidance He has sent, His Promises and obey Him and His Messenger in goodness, then He will reward us for our good in a Paradise which is forever.
If we however reject Him, and argue that God has lied, and that He never sends us guidance, and we reject His Messengers'. Then He can punish us in Hell, and why can't He when we are created by Him, and He has ordered us to obey Him, so what gives us the right to reject Him and His Message? If we are arrogant in this, then He is not in need of us, and He can punish us in hell if He wishes.
If God can reward those who believe and do good in Paradise forever, He can also punish those who reject Him and do evil forever too.
Peace.