trying to save but still not working

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i have recently started working, and have been averaging from work about $200-300. and then i still get some money off centrelink. im trying to save some money so i can go visit my sister in august because she is due to give birth to her baby then and i havent seen them for nearly a year now, she has 2 other children 9 and 7. i miss them like crazy, but we are also having to travel regular to sydney so my partner can have operation plus check ups on his ears, but i still cant seem to save the money in my bank, half the time i cant say where its even going, fuel, food, bills or sometimes just waste on clothes or credit for my phone or just a treat, i know i need to learn to minimise all this but it still not happening, have you had to do this and how did you do it.. can you give me any pointers at all. thanks