Breastfeeding, No Mense And Trying For 2nd One

Dear mummies, I have been breastfeeding my boy. He jus turn 1 this month. I wanted to breastfeed him as long as I can. I heard some saying thus I Want to clarify some items... 1) Do breastmilk after 1 year lack of nutiriton? Some mummies will top up with fresh milk 2) my mense did not come back. Hub and i are making plan for 2nd one. But i do not want to stop bf. Would that be possible? Look forward to your replies Pls... Thank you!