I found a website that I thought might be helpful. There's some helpful tips, many of which pertain to the questions you have listed.
www.christianadvice.net/christian_marriage.htm
What the Bible says about Christian Marriage
Marriage was instituted in Paradise when man was in innocence (Gen. 2:18-24). Here we have the Christian marriage service its original charter, which was confirmed by our Lord, as the basis on which all regulations are to be framed for marriage (Matt. 19:4, 5).
Christian Marriage is a permanent, committed relationship
Matthew 19:5-6, TLB.
'And that a man will leave his father and mother, and be forever united to his wife. The two shall become one - no longer two, but one in matrimony! And no man may divorce what God has joined together'.
What importance is given to Christian marriage?
"Marriage should be honored by all, and the marriage bed kept pure, for God will judge the adulterer and all the sexually immoral." Hebrews 13:4.
Our Lord corrected many false notions then existing on the subject of marriage (Matt. 22:23-30), and placed it as a divine institution on the highest grounds. The apostles state clearly and enforce the nuptial duties of husband and wife (Eph. 5:22-33; Col. 3:18, 19; 1 Pet. 3:1-7).
Marriage is said to be "honorable" (Heb. 13:4), and the prohibition of it is noted as one of the marks of degenerate times (1 Tim. 4:3). It is is used to represent the union between God and his people (Isa. 54:5; Jer. 3:1-14; Hos. 2:9, 20). In the New Testament it represents the love of Christ to his saints (Eph. 5:25-27). The Church of the redeemed is the "Bride, the Lamb's wife" (Rev. 19:7-9). Marriage should be honored by all, and the marriage bed kept pure, for God will judge the adulterer and all the sexually immoral. Hebrews 13:4
if only one partner is unbelieving . . .
what are marital duties for men and women?
To the men . .The husband should fulfill his marital duty to his wife, and likewise the wife to her husband.(1 Corinthians 7:3). Since there is so much immorality, each man should have his own wife, and each woman her own husband. "Matthew 19:10 However, each one of you also must love his wife as he loves himself, and the wife must respect her husband. Romans 7:2 The wife's body does not belong to her alone but also to her husband. In the same way, the husband's body does not belong to him alone but also to his wife.
Christian Marriage requires submission of both partners!
"You wives must submit to your husbands' leadership in the same way you submit to the Lord. For a husband is in charge of his wife in the same way Christ is in charge of His body the church. (He gave His very life to take care of it and be its Savior!) Ephesians 5:21, NIV. "Submit to one another out of reverence for Christ."
How should husbands relate to their wives?Ephesians 5:25-28, TLB.
"And you husbands, show the same kind of love to your wives as Christ showed to the church when He died for her. . . That's how husbands should treat their wives, loving them as parts of themselves. For since a man and his wife are one, a man is really doing himself a favor and loving himself when he loves his wife!
Husbands should honor their wives. Peter 3:7, TLB.
"You husbands must be careful of your wives, being thoughtful of their needs and honoring them as the weaker sex. Remember that you and your wife are partners in receiving God's blessings, and if you don't treat her as you should, your prayers will not get ready answers."
God promised a virgin for Christ!
I promised you to one husband, to Christ, so that I might present you as a pure virgin to him. 2 Corinthians 11:2
The seventh and the tenth commandments guard marriage. Exodus 20:14, 17, NIV. "You shall not commit adultery." And "You shall not covet your neighbor's wife."
settle misunderstanding fast! Ephesians 4:26, TLB.
"If you are angry, don't sin by nursing your grudge. Don't let the sun go down with you still angry -get over it quickly."
the Bible forbids physical or verbal spouse abuse Colossians 3:19, NIV. "Husbands, love your wives and do not be harsh with them."
Keep the relationship growing in unity and understanding. Ephesians 4:2-3, TLB. "Be patient with each other, making allowance for each other's faults because of your love. Be led together by the Holy Spirit to be at peace with one another."
is there an acceptable reason for ending a marriage? Matthew 5:32, NIV. "But I tell you that anyone who divorces his wife, except for marital unfaithfulness, causes her to commit adultery, and anyone who marries a woman so divorced commits adultery."
how long is marriage intended to last?
"By law a married woman is bound to her husband as long as he lives. But if her husband dies, she is free to marry anyone she wishes, but he must belong to the Lord.1 Corinthians 7:39
who should we marry? II Corinthians 6:14, RSV.
"Do not be mismated with unbelievers. For what partnership have righteousness and iniquity? Or what fellowship has light with dark?"
what about romance?Proverbs 5:18-19, TLB
"Let your manhood be a blessing; rejoice in the wife of your youth. Let her charms and tender embrace satisfy you. Let her love alone fill you with delight.