Hi Mike,
Inside the oil filter body which you gain access to by removing the retaining bolt in the center on the top, there is a filler mark. fill with engine oil to this mark.
If you contact Jack, he has a copy of the Morris w/shop manual which I sent him so you should be able to download it, failing that, send me your address and I will mail you a copy.
With regard to the ignition warning light, it should come on when you turn on the ignition and go out when you start the engine.
Regards,
John.