How to wait a function finishes and pass variable between files in Roku BrightScript

I'm building a Roku channel and I'm facing a problem where I need a function to finish in order to run the lines afterwards & also I cant figure how to access a variable between components, this is the flow I have:

file1.brs

MainFunction.observeField("itemSelected", "func1") -first wait for this to finish
MainFunction.observeField("itemSelected", "func2") -then run this

sub func2()
    print var1
end sub

file2.brs

sub func1()
    var1 = (get content from some database)
end sub