You can control an opportunity by adding different stages to it, follow these easy steps:
Step 1: Select 'All Types'

On ribbon, click the "Opportunity" tab.
Under Opportunities group, select "All Type".
Step 2: Select Existing Opportunity Type

Here you can view different types for opportunities according to your requirements. Double-click the type to which you want to add stages. After this selection, you will be moved to step-3.
Step 3: Select 'New'

Right click on lower pane of this window and select "New". It will pop open a new window where you can add new stage (or stages) for selected type.
Step 4: Enter Name

Here you can enter name for this new stage. Make sure the opportunity type is same that you selected in previous step (step-2).
Step 5: Click 'Save & Close'
When you have finished to enter all the desired info, to save this data, choose any one option on ribbon:
Save and Close: saves everything you have entered so far and closes the form
Save and New: saves everything you have entered so far and reopens a blank form for another entry.