Welcome in the fascinating world of PSoCs!
PSoC1. 8 bit MCU rather small. Use one of the others for new design
PSoC3: 8051 MCU. Design is from 1980, so I would choose a more modern solution
PSoC4: ARM M0 MCU
PSoC5: ARM M3 MCU
PSoC6 ARM M0+ and ARM M3, a dual core solution
The development tool for PSoC3 to 6 is named Cypress Creator (4.1) and can be downloaded for free from Cypress website.
What makes the PSoCs so different from other competitor's chips are the hardware components which are used like in electronic CAD programs: You place the needed functions as timers, counters, serial interfaces, ADCs, DACs, DMA channels, logic gates, FFs and.. and.. and. Then you configure these components and wire them as required. Then with a bit (or more) C-Language you control the hardware as required. For most of the components there are ready made examples, you can get prototyping kits for $10 which contain programmer and debug interface. Dasheets for a component is just a mouse click away and this forum will always be of some help.
More questions? There is a bunch of videos (each about 5 to 10 minutes) showing how to master the basics.
I have a new question. where i can find the example to insert in my PSoC Designer IDE. Now i need to use CSD with 3 button to turn on/off 3 LED.
On Start page you read "Find Code Example"
Right click on CSD component and select "Find Code Example"
You may open two (or more) instances of Creator, so with copy and paste you are able to add schematics and code as you need.