it depends on the "something" you choose, but basically:
Planning is basically all the preparation, including goal making, prioritising and moving forward to begin organising.
Organising is when you put things into place the things that are needed for the plan to be implemented.
Implementing is about actions. This is the "doing" step.
Evaluating happens throughout the process, making judgements on the effectiveness of decisions and how successful you have been in achieving goals.
(that was all taken from the Excel study guide!!)
Now, an actual example of this might be the planning of a party or something like that. Hopefully this is along the lines of what you want.
First of all you would have to decide where to have the party, who to invite, when is it going to be, ordering food, etc. What sort of party do you want it to be for your guests? You would have to think about which are the most important things to focus on first. (PLANNING)
Next you would have to organise invitations, decide on a venue, who to invite, organise a caterer, decide what sort of cake, etc. (ORGANISING)
Then you would have to send the invitations out, manage RSVPs, book the venue, pay the caterer, book and collect the cake/decorations and actually HAVE the party. (IMPLEMENTING)
Finally, you would reflect on the processes. What made the party successful? If there were things you would change next time, what would they be? Did the caterer cook the food properly? Was the cake stale when you bought it? etc. (EVALUATING)
I hope this helps a little anyway!!