my arabic isnt very good = Lughatee al-arabiya laysat jayyedah jiddan
I am new to learning arabic = ana mazeltu mubtadi-a fi al-lugha al-arabiya (Lit. : I'm still beginner in Arabic language)
p.s : The sesond dentence is said by a female, if you want a male sais this sentence, you just need to change "mubtadi-a" (adj "beginner" for a female) to "mubtadi" (adj "beginner" for a male)