You are already a Muslim but you have not realized that , Islam is very easy to get into you just say those two lines consciously and you are a Muslim , but the path to the oneness of Allah and internalizing that would be long and need lot of love and passion ( Ishq in Iqbal terminology)

read some thing which might resonate with the path you are treading on https://www.amazon.com/Road-Mecca-Muhammad-Asad/dp/1887752374