Dear brother ZaydAssalam. Well, you first need to fill out the application SET(M) perfectly. Then you need following documents: (I submitted all these)
1) Passport size photos, yours- 1 and partner's- 2.
2) Passports of your partner and your.
3) Biometric residence permit- Your partner's
4) Marriage certificate
5) Bank statements (preferably jointly)
6) Pay slips (yours and partner's if she is working)
7) Life in the UK test letter (your partner's)
8) 6 letters to you and your partner from 3 or more different sources in last 2 years.
9) Tenancy agreement ( preferable in joint name)
10) Bank savings statement (preferably in joint names)
11) Tax credit letters (if any)
12) Work contract letters (your and your partners)
You may add more documents according to your circumstances.
Click here to download SET(M) form:
http://www.ukba.homeoffice.gov.uk/visas-immigration/partners-families/citizens-settled/spouse-cp/settlement/
You will get the Form, Guidance Notes and Photographic guides files here.
Best wishes
Maruf