I'm 17, moving to Melbourne alone

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Hello guys! Me again, I feel like I'm always asking questions.! 
Anyway! I am 17 and next year (2 months before I turn 18) I will be making the big move to Melbourne to Australia! 
Now, I understand most of you probably aren't from Melbourne, or Australia for that fact! But could anyone living in, or knowing Melbourne, please answer a few of my questions?? 
What is a good suburb to live in in Melbourne? I don't mind how close I am to the city, close or far, it doesn't matter. 
Of those places, which is cheap? I know Melbourne can be expensive, I'm willing to pay, It is only me but I am willing to pay for a 2 or 3 bedroom house! 
I am a huge beach person. So I would like to be close to a nice beach! 
And a huge question!.. how hard is it for a 17 year old to get a house and how would those chances be lowered and be able to get a house a little easier? I have heard of youth groups/support stystems making it a little easier. 
Oh, and another thing, I do have a friend in Langwarrin, and the area is very very nice and kind of homey, considering I am a country girl! So I am happy to be around the Frankston area, just very nervous due to the bad record it has!!! 
Thank you!!