Initial financing in brrrr

[Joe Sniadowski]

when it comes to the financing part of brrrr, what is the origional financing set at?  30 year, 15 year?  I cant seem to find the initial purchasing method in any of the posts, blogs, guides etc.  it simply states “buy”, rehab, rent, refinance (assuminng from 30 year to 15 year?), but theres no clear formula that i can find that says buy at “30 years”.  And then the refinancing seems to be a bit vague as well as far as just getting appraised.  Is it better to keep at 30 years and then appraise and refinance again at 30 or bring down to 15?  

Sorry for the rookie question.  Any help or just more clear instruction is greatly appreciated as always