Hi, I am new to programming and have also started late in life (57), looking at the TONE tutorial it should be possible to make the UNO play one continuious tone of 600Hz but at the moment I am having difficulty working out how, thanks for any help you can offer, Colin.
Start by writing some code, like the minimum example then, add what you think needs to be in place to make tone() play to a speaker or digital pin if you make mistakes that is OK as it will give you a starting point.
Post the code that you have made, and we will help you correct it or make it work.
Many thanks for the replies, learn by doing is the way to go.
I am new to programming and have also started late in life (57)
I wish I will be able to start something at 57............. 
Great for you!