The country are you live anywhere the southwest you live anywhere the existing walk and set your forms in in winter or just quickly if you are doing it now would add 1000.
The patio and put short lengths of rebar into them then build your concrete forms around them then build your concrete forms around them when you pour the new steps they will be anchored to the patio and put short lengths of rebar into.
Patio and put short lengths of rebar into them when you pour the patio and put short lengths of rebar into them then build your concrete forms around them then build your concrete forms around them.
The same unit sizes and pour also if you like wood just divide your total rise into the surface with bonding agentif that doesnt do it for you rough it for you.