"I want to learn Chinese language because I enjoy studying new things a lot"

So, maybe this is better:

我想学中文是因我爱学习很/更多心新事情/物、多   

<em>(the order should be adjusted and the "心"means "heart" but not "new". "</em>事<em>" means same with "</em>事情/<em>物" but it would be odd in some cases if you only say ”</em>事<em>")</em>

Let me try some more:

My Chinese writing (ability) is not good (yet)

在我的汉字拼写是的不好不是很好

<em>（1.sometimes we say as "not so good" in chinese when we euphemistic </em><em>criticize ourselves just like "don't think so//not really" in english. but if you really mean so, you could say "</em>很差<em>“worse， instead of "not good"---"我</em>的汉字拼写很差/糟糕/不好<em>”. </em>

<em>2."</em>在<em>"means a location, likes "in/at/on".</em>

<em> 3."汉字" is a sample noun and just means"chinese characters", and ability of "writing chinese characters should be "</em>汉字拼写<em>"）</em>

FIGHT~

hope that could help you~:]