I will be meeting the financial requirement with my salaried employment, we aren't applying till April because it'll take me till about Feb/Mar to build up the 6 months worth of payslips (only just got a payrise).
I currently live in a rented flat and will be asking my landords permission for him to stay here when I renew my lease in March.
That's great.
For the accommodation requirement, you will need your lease and a letter from the landlord granting permission for him to live there when the visa is approved.
For the financial documents, you will need a full 6 months worth of pay slips and not a day less.
A full 6 months of bank statements covering the same time period and showing all the deposits, you will probably need to include 7 months to get the correct overlap.
A letter from your employer (see FM-SE)
Original job contract and P60 are optional but recommended
For the relationship evidence,
Your marriage certificate,
any divorce certificates,
You will also need to write a letter of sponsorship.
A few photos of the two of you together.
Evidence of how you have kept in touch for the length of the relationship.
Boarding passes for trips to see each other.
Physical letters/cards you have given to each other.
Also include, all the receipts for payment, IHS, priority etc his passport, your passport copy preferably notarised, return shipping information, stamped biometric letter, passport photo,
Printed online application, appendix 2
That's just off the top of my head so do run your list by us before you apply,
Read this carefully too.
https://www.gov.uk/guidance/immigration-rules/immigration-rules-appendix-fm-se-family-members-specified-evidence