designing an electric timer

I need to create a simple digital for a mini basketball field model that I am building. This digital timer will have 2 digits only, and will display second from 00-59. Example of a 24 second clock from a real basketball game - attached. Note that i need a 00-59 seconds timer. What I need is someone that will DESIGN this small circut and will write me a short manual that will help me assemble it here by myself. - This circut should contain the minimal components needed for that. - the components will be simple, so it could found in any electric store. - It should contain two optional versions: 1. a device with an on/off switch. Once the device will turned on, the second will start from 00 regardless to where they were when they shut down. 2. A device with no on/off switch. Once the batteries are loaded, it will start counting from 00. - It will contain the minimum battery power needed, with preferability to one AA battery. - The digital display should be non noisy one (not mechanic), and should be durable and not pricey. For any question fell free to ask me, thanks a lot.