Amana oven gas leak issue

if you only get a gas smell when you turn on the oven then it is not likely you have a gas leak- the ignitor resistance drops as it heats up and when it drops low enough the main gas valve opens and the gas ignites from the hot ignitor. If however you have a gas smell all the time and have to shut off the main gas valve (at the flex line) then you have a problem. Not sure where you are located but here in the bay area (CA) our local utility company will come out and do a leak check  for you gratis. As for the burners not lighting- do you see a spark at the burner you are trying to light? If so, the burner is dirty. If you don't here a clicking sound when you turn the know the igniter switch is probably bad.