58 yrs with past few very sedentary

I am 58 and have lived through a lot of stress over the past few yrs. I am ready to move forward with my life. I want to move more freely with grace. (Right now I feel like it is hard to tie my shoes with my stomach in the way, etc) I want to feel comfortable going and doing things without feeling pain in my knees, ankle, somewhat out of breath and feel prettier and a lot better about myself. I want to feel good in clothes and wear some nice outfits that I have packed away for that 'someday'. I am a smoker (I quit for yrs and then started again a few yrs ago). I drink beer but have switched to a brand with 44 calories as well as cut back on the amount. I eat what ever I want and yet I have a good knowledge of what is best to eat and not to eat. I joined a gym Dec 30, 2011 and I am looking forward to a great yr.