7th Chord Progressions And Modes Options

[MrVegas]

hello, I'm practicing some chord progressions and modes, I understand how to build major and minor chords and know where my modes are. and I'm trying to understand the theory behind it all.
when your in a major key the I chord can be a major7th the ii, iv, and vi can be played as minor 7th the 4th major 7th, the 5th as a dominant7.
if I play dorian over a ii, iv,IV progression built from the major scale I could still use 7th chords with dorian mode. so I guess what I'm asking is as I'm trying to get all of this committed to memory am I correct on how seventh chords and the the dorian mode fits into building chord progressions from the major scale? also is the 5 chord always a dominant chord in major and minor?
I'm trying to commit all keys to memory and want to get as comfortable with this to the point someone can tell me a progression with numbers in a particular key and I know exactly what chords to use without much thought, any tips and suggestions?

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