When I first joined the RP, I know I was in the same position. For the most part just detail why youre truly interested in the village. For example detailing that you want to be apart of the village as it was always your favorite int he Naruto manga, or that you believe there is something that you can bring to Suna that most can't.
Just be honest and widen your imagination to why you want to be apart of the village system. It doesnt hurt to be direct also. If youre not strong and you believe they wont accept you because of it, just tell them you are trying to get better if you truly are.