Chapter 1
This is a song, per MSB.  I see that the sections each have a "speaker", as a play would have.  So there is a dialogue back and forth.  A note says the translators have added these words based on the gender and number of the Hebrew verbs.  So they aren't really t here.  MSB has an outline of the book, and 1:2-3:5 are about the courtship. 
First section:  The bride is speaking, announcing her love, and describing the reasons she is so dark.  Her brothers were angry with her and made her tend the sheep in the fields.
Second, The two alternate describing each other.  She talks about perfumes.  She is sensitive to his smell. 

Chapter 2
First section:  Mostly her speaking.  They are trees.  This chapter has Rose of Sharon and Lilly of the Valley in it,  but I don't see it as obvious who is speaking. 
Second:  More of her pining for him.

Chapter 3
Described as "The Bride's Dream".  She wakes up and he's not there, and she goes out looking for him.  She finds him, and brings him home to her mother's house.  The "clue" that it's a dream is vs 1, "On my bed by night..."
Vs 5 is a repeat of 2:7. 

The outline from MSB says 3:6-5:1 is the wedding.
Solomon is arriving, carried in a litter made of cedar overlaid with silver and gold.  He has 60 men armed for battle around him.  He is a powerful, wealthy man.  He is here for the wedding.

Chapter 4
Titled "Solomon admires his bride's beauty"
1st section, Solomon describes his bride.  Eyes, hair, teeth, lips, cheeks, neck, breasts.  Her skin is not mentioned.  She told us she was very dark, but Solomon does not mention this.
2nd section, Solomon describes how he is smitten - captivated - by his bride's love.  He is overcome.  He now describes her scent.  Smell was a big deal to them both, they were both excited by it.  MSB says 4:1 to 5:1 describe their first night together.  Indeed, in 4:16b, she says let my beloved come to his garden, and he answers in 5:1 "I came to my garden, my sister, my bride.  I gathered, I ate, I drank.

Chapter 5
MSB says 5:2 to 8:14 is the marriage, and that 5:2 to 6:3 is the first major disagreement.
1st section, Hmm...He shows up at the door after a night out - hunting? drinking? working? - and she has already gotten ready for bed, and doesn't want to open the door.  He could be drunk, he could just be dirty.  She does open the door finally, but he's gotten tired of waiting and left.  Now she goes to find him, and those watchmen find her.  They are physically violent to her.  Apparently she's not supposed to be out.  She doesn't find him.
Others ask why they should keep a lookout for him to tell him his bride loves him.
2nd section, She tells them why.  He is ruddy.  Perhaps a redhead like his Dad.  She describes his hair, head, eyes, cheeks, lips, arms, body, legs, appearance, mouth.

Chapter 6
They ask where he's gone to then?
1st section:  She is speaking.  Two verses.  She tells them he's gone to his garden to graze his flock.
2nd section:  He is speaking.  vvs 4-7 are a repeat of his description of her in 4.  He says she is most desirable among his 60 queens, 80 concubines, and virgins "without number". 
3rd section:  She answers.  Verses 11-13 make little sense to me.

Chapter 7
Section 1, Seems to be Solomon talking again.  He describes her again, this time more intimately.  Her feet, thighs, navel, belly, breasts, neck, eyes, nose, head, hair in tresses.  He seems to be missing her, emotionally in 6, as when they first met, but physically in 7, as a husband misses his wife.  He seems to be done with their disagreement.
Section 2, He resolves to go to her, perhaps to be the one to apologize.  He misses her too much to continue being standoffish.  In 9b and 10, she seems to accept his advances.  10 says I am my beloved's and he is mine.
Third section:  She is speaking.  Looks like he's joining her on the trip she had planned.  He is on her turf now.

Chapter 8
She is still speaking.  Wishing she could be more familiar with him.  She repeats the phrases from the dream about bringing him into her mother's house, and also the phrase about no stirring up or awakening love until it pleases.  This is the third time this phrase shows up.
vs 5 I don't understand.
Next section:  Love, true love, is priceless, valued above all things.

Conclusion:  No idea.  Seems random.  MSB says a wall is moral purity, a door is an openness to immorality.  Her brothers speak "Oh little sister..." to say they kept her pure when she was young.  In vs 10, she says she stayed pure, and was a virgin on her wedding night.  This started them off well in marriage.  He had peace, no worries about her purity.  The rest...even MSB wasn't sure.