Previous visa needed? Flight out of China?

Hello,
I am travelling to Beijing by train from Mongolia on the 2nd of September, I am travelling with an organized tour company untill I arrive in PRC.

What I would like to know please for when I send in my application -

I visited PRC back in 2005 but have a new passport since then so do I need to supply those previous visa details as I no longer have my old passport? If I do need to supply those details how would I find out about my previous entry permit?

I plan to have all my accommodation and transport booked in advance as I travel across PRC to Myanmar so do I need an invitation letter or will having proof of where I will be staying and a flight or train or bus leaving be enough? Is having a train or bus ticket out of PRC enough or do I need to fly to Myanmar?

I am currently unemployed as I received an inheritance from my father which has enabled me to go travelling so seeing as I have no employment do I need to send proof of my finances to show that I can support myself while visiting PRC?

I plan to apply for my chinese entry permit on the 2nd of June as I know I cannot apply for it before 3 months.

Please let me know if there is anything else I should know or include as I would like to start my travels as soon as I can in June once I receive my Chinese entry permit.

Thank you very much for your time.