The apps UI is pretty much self explained (unless you want to use the advance functions).
Just add a new task, choose your source, destination, and schedule. Then you are good to go.
However, if you use Time Capsule as the destination, don't expect any good performance. It seems the transfer speed is capped at around 30MB/s. Since no idea how much data you have, therefore, it's impossible to estimate how long it takes for the initial backup. But may can divide your total data size (in MB) by 25. That should be the estimated time in second.
e.g. If you have 100GB data to backup. Than 100GB is about 100000MB. Divided by 25 is about 4000. And 4000 seconds is about 1.1 hour. Therefore, I expect the initial backup may take around 70minutes.
In general, Time Machine is good for recovering files. But CCC is good for whole system recovery.