your not married yet and your looking at a settlement visa ! ?
thing you need first is a 2yr spouse visa b4 that.. and after 2 years apply for settlement

oh and for your question,

5.8 Is this an arranged marriage/civil partnership ?

plain english, an arranged marriage is usually when the parents choose their son's or daughter's future spouse (usually Indian, muslim's)
and for civil partnetship, it enables a same-sex couple to register as civil partners of each other under UK law.

usually both wouldn't apply to most people on here.