TRV questions for invitation letter ?

hey guys,

my friend gonna invites me to get TRV to canada. we need to know some questions about the invitation letter.. etc

1- i know what details should get in the letter, how do i write the outlines of the letter , can u plz tell me or post here an example for it.

2- the embassy asks about *A verifiable statement of income from a reliable third party source.* for my host in canada, whats that and how can i get it and where ?

3- about the employment letter for my host in canada, she can't get it cuz she have to been in the work for at least 6 months to get that info. but she only been 3 months, is it nessecry or what ?

plz help me ....thx very much