zedman,
It could be a few things that are causing you problems with starting.
1. Fuel filter in tank blocked.
2. Main jet blocked.
3. Old fuel.
4. Fuel mix incorrect as can has not been shaken.
5. As the air filter is old it should be replaced.
6. Replace spark plug.
7. When starting mower it should be in the start position.
I hope that this will be of some assistance.
We do have a workshop manual in the parts list and manuals area of the forum.
