driving radio well shut off car turns off after awhile then got a jump car start

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Was driving car radio started to turn off so i would push the íºnlock button the remote radio would come back on. Went to store left car on in fear it alimentos start no more than 5-10minutes car turned off by itself. Rí­en it would only crank not start. After 10 mins of trying í­ killed the battery. So maybe 20-30 minsmaybe even 45 mins goes by after car stopped í­ got a jump ame after two times of trying to start it car started right up so i drove it 14 miles to my house. Parked it turned it off and went to turn it on and it started right up. Please í­ am single mother tight on money and need any help on this problem í­ just got the car love it but really cant afford to take it to dealership to fix but well if i have to when í­ get paid. Also does anyone know is it hard to hook up if i wanted to upgrade the stereo to a bose stock radio for a 1997 catera?