4 different questions Please.

1) Bought a New home in Georgia with my Boyfriend, if we are not married ,both single and file taxes separate - would it be more worthwhile to file joint as far as taxes are concerned??  

2) I Have my home in Texas that I rent as income since I moved to Georgia, I am retired and that is my only income, (Other than some of my collectible dolls I sell to downsize my home since I moved, and a couple distributions I have taken from my 401K.) I do not claim Social Security yet. How do I claim that on my Taxes or do I even have too???? 

3) I collect my Doll sales money on Paypal - they said they will be sending out a tax form and they charge me fees for each transaction - how do I claim that as well???? 

4) Do I have to claim my Distribution Money, since they took the Taxes out???

Thank you

Bobbie Brennan