Simple (informal) Japanese Introduction

(I know hiragana but I can't type with it sorry)

Ohayou. boku wa Yan da. Jukyu sai da. Eigo to Furansugo wo hanasu koto ga dekiru. Nihongo wo naratte iru. Boku no inu to neko wo ga iru.

-- Hi my name is Ian. I am 19 years old. I speak english and french. I am learning japanese. I have a dog and a cat.

ぼくもにほんごをべんきょうしている。このコレクションはせいかいきぼうする。

sai => "years old"

koto ga dekiru => 'koto' nominalizes the verb and 'dekiru' is to be able to. So "hanasu koto ga dekiru" is "can speak"

In the last sentence, 'ga' is used instead of 'wo', as 'wo' is used for the direct object of a transitive verb. Iru is an intransitive verb however.

がんばってください！

Simple (informal) Japanese Introduction

(I know hiragana but I can't type with it sorry)

Ohaiyou, boku wa Yan da. Juukyuu sai da. Eigo to Furansu go wo hanasu. Nihongo wo naratte iru. inu to neko wo katte iru.

-- Hi my name is Ian. I am 19 years old. I speak english and french. I am learning japanese. I have a dog and a cat.

Good job! Though your sentences are correct grammatically, ending with "da" sounds a bit strong in colloquial in my opinion. So we use "the suffixes" like "yo, ne" however, I think using these suffixies like us is difficult, so please get accustomed to them little by little. After all, I would say: 

Ohayou! Boku wa Yan. Juukyuu sai da yo. Eigo to furansu go ga hanaseru. Nihongo wo benkyou shite iru. Inu to neko wo katte iru yo. 

I hope this was helpful.