fitness help/advice?

I'm broke and find it hard to buy healthy foods, it all just seems so pricey and so when I do buy it, its only enough to last a day or 2. I'm not even sure what I should be eating everyday so I'm probably leaving important stuff out. I also don't know what exercises I should be doing or if I can get fit with no equipment. I just want to be healthy/stronger, any advice? im 5'5, 130 pounds, how much calories should i get per day?