Lets take the oven problem first. Sounds like you have a Hot Surface Ignitor problem. This is the device that glows and lights the burner. You can buy a universal ignitor at most appliance or heating and air conditioning supply houses. Note carefully how the old one is mounted. You may have to make some adjustments to mount the new ignitor, but it MUST be close to the gas burner like the old one! You don't smell gas because the gas valve will not open until the ignitor is hot. All ignitors work with the same voltage, so simply connect the new wires to the old ones.

I'm not certain if you have a standing pilot for the stove top burners or electronic ignition. Remove the top panel to check. If you have a gas pilot, relight it. If electronic ignition, clean the ignitors. If that does not solve the problem you may have to call a technician, as these systems can be complex.

Hope this helps.

Ray