Greetings Bro,
You will get different answers to this question , some say a Master Mason should wait a set amount of time , some say you should go in when ever YOU think you are ready . I am of the mind that it is up to each individual Brother when he should petition a concordant/appendant body . I petitioned the YR soon after I was Raised and it never hampered me in my learning the ins and outs of my Blue Lodge , but just the opposite , It helped me tremendously . Not only did it give me greater clarity and understanding of the Blue Lodge , it also gave me the opportunity to get to know even more Masons , from many different lodges much more quickly and this in turn gave me larger pool of knowledgeable brethren to turn too for questions I needed answered .