Ok couple things here. Take your battery to be tested. If it is on then have them charge it. Put it back in the car. See if it will start after putting a charged battery. If it does, then with the engine running disconnect the battery. If it dies you need a new alternator. Which would keep the battery from charging. Either way you need a battery that can hold a charge.
Go into your fuse blocks and check your fuses one by one. Takes some time but will tell you if a fuse is the problem. Start there n we can go further if needed. You'll especially need to check the larger fuses. Those are the ones that let the vehicle start.