I use a budget program called YNAB (you need a budget). I love it. Its only $50 a year and IMO very worth it. You don't need a program like YNAB and can go old school and use an Excel spreadsheet. Its all great.
My budget is about $1800-2000 a month. I have it broken down like this. Take the dollar you make
You have a dollar. I break it down into 60/30/10 That means .60 cents is spent on me (food, rent, fun), .30 is spent on my investments and .10 cents goes into my saveings. The savings is important because at a minimum you need to have $2000 set aside for emergencies. And eventually, 3-12 months set aside. So, if I spend $2000 a month I should have $12,000 set aside just incase something major happens. That covers any issues that may crop up. Its also a nice 6 month cushion. I have that btw.
That is all the money you should be keeping in your bank, because the interest paid with the traditional banks is pathetic. Its like 0.001% I'm currently looking for another bank that will give me a 3- 6% return on my money. I'm currently using Bank of America to just to pay bills and to keep my $12,000 emergency fund in. That's about it. Oh, and I practice the if I can't buy 5 rule I can't buy 1. This means that say I'm looking at a car worth $25,000 Well if I can't buy 5 of those with cash ($125,000) then I can't afford it. You can always play with this rule. You can bring it down to if I can't buy 3 rule I can't buy 1. I like the 5- 1 ratio though. It keeps me honest. If more people practiced this rule we wouldn't have most of the US population living paycheck to paycheck. Cars are the biggest waste of cash when you think about it. They depreciate quickly. And yet, most people go into debt because they are insecure and need a new car to gain validation from strangers they don't even know. But, if they took that $250- 500 they are spening on that car and only invested it they would be on their way to having a very nice retirement. And possibly retiring much earlier. But, most people have got to have a nice car that they won't even remember 20 years from now. Just saying.