Ok for when I get to england if im approved do they give you a post office location to go to or will it be at your local post office?
I believe it tells you which post office it will be when you submit the online application. Also, the letter that arrives with your visa will give you instructions on where, when and how to pick up the BRP.
Do I have to pay for priority and return postage before my biometrics or after? Or does it not matter as long as its before you mail the application since the receipts have to be in the envelope?
You can pay for it whenever you like, though you will need your GWF application number. Some people have had problems with the VFS Global site and being able to purchase the services, so I would do it sooner rather than later.
Should we be including letters from family members about my entry refusal? Or just a letter (cover letter) stating what happened and what I did following it?
No, letters from family members CANNOT be considered.
All you need to do is list the refusal, include any paperwork if you have it, and then give a short explanation (couple of sentences) in your cover letter.
Also for the first two years of my husband and I living together we were living with family so we don't have rental leases BUT we did get married during 2011 for proof along with photos of it and in 2011 my husbands green card was approved and we have the approval letter with the address and his green card given that year and then tax returns we filed of the year of 2011 would this be enough evidence for that year?
For that year, I would just include your marriage certificate, 1 photo of you and your spouse at the wedding, and your tax return for that year.
You don't need to include anything about the green card, but I guess you could include the letter with your address on it, if it matches the address on the tax return.
Basically, you're looking to include proof of LIVING together, by way of mail at the same address each other... so as long as you have a tax return with both names and your address on it, you're good to go.
The marriage certificate and photo are needed regardless of how long you've been married.
Then for the year 2012 we have a few photos we can submit and a USCIS change of address form we filed for my husbands greencard with the residence we were staying at and we have our 2012 tax returns. Would this be enough for that year or should I get a letter from my father stating that we were living at that address and visiting him regularly as a family for further proof of our relationship for that year?
Just include the 2012 tax return. Nothing else is needed.
Only 2 photos should be sent in total - I would send one from the wedding and one more recent one. They are only used to determine you have met in person at least once.
And lastly I was told not to submit our daughters birth certificate since their citizens but wouldnt it also be ok to submit copys as further proof that we had an ongoing relationship since its lists both of us for mother and father and the year gaps to show we were together the whole time? I don't know if that makes sense it was just something I was curious about.
You could include them if you really wanted, but they are not required and likely won't be looked at.
All they really consider for relationship evidence is evidence that you both lived at the same address at the same time while living in the same country, and also evidence of regular communication if you have lived apart at any time since the wedding.
Birth certificates do not prove evidence of continuous co-habitation since 2011, so I doubt they will have any bearing on the application. After all, you could have children, but still not be living together in a subsisting relationship.