Nice to meet.

I am Luna. I come from Madrid and want to learn english. My best sport is tenis and I like to color and rite things. I hope to make friends here and learn much.

Nice to meet you.

I'm Luna (1), I come from Madrid and I want to learn english. My favourite sport is tennis (2) and I like to write and draw (3). I hope to make friends here and learn a lot. (4)

1. I'm would be used more than I am, unless you were trying to put emphasis on the verb.

i.e. "You're not Luna."  Response:"Yes I am."

2. My favourite sport sounds more natural than 'my best sport'. Even though 'favourite' refers to how much you like the sport, rather than how good you are at it, 'my favourite sport is tennis' implies that you are probably good at it and it is the one you do most often.

3. Write has a silent W, also I think you mean 'draw' rather than 'colour'. 'I like to colour' sounds more like what a small child (young child) would do. An adult or teenager would be interested in 'drawing'. (Colour is British English, Color is American English. So color is not necessarily a mistake, depending on who you are talking to).

4. 'to learn a lot' sounds better than 'to learn much'.

Hope this helps.

Nice to meet you.

I am Luna. I come from Madrid and want to learn English. My best sport is tenis and I like to color and write things. I hope to make friends here and learn a lot.