Ohayou!

Watashi no namae ha (pronounced wa) Burandon desu. Watashi wa nihongo wo (pronounced oh) benkyou shimasu desu.

I wouldn't use watakushi unless you want to be ultra polite, or interviewing for a job, etc.  Remember to use the topic marker ha (said like wa) unless the topic is already known. The wo (oh) is the direct object. 

Watashi ha = I am the topic

Nihongo wo = This is the object of the verb

benkyou shimasu (polite form of verb benkyou suru) = studying/will study