The start

So in March a year from now I am travelling to Asia and South America. Im going to save up $20,000 and hopefully $10,000 on a credit card. So that can be $30,000 that I can go with. I'm hoping that after I pay most things off, like some of my Student Loan and getting my teeth fixed. There may just be a need for two root canals at $1300 each they dont come cheap and then I have 9 more holes to fix at say $200 each so thats....$2600 + 9 x $200 = $1800 = $4400. So I have just worked out that by March next year I would have only saved $10,200... Are you kidding me thats not enough. I need to figure out a way to save more. I have my $50 a week as a off the side savings account so by the end of 25 pay fortnights it is $1600 and thats with the extra $350 that's already in there.