I have following chip : ATMEGA328P-PU Embedded microcontroller PDIP-28 8-Bit 20 MHz Aantal I/O's 23 Can someone say how I can bootlead this one. And use it without the arduino.

Thank you!

The specifics will depend on your clock source and speed. If you have the same hardware configuration as one of the standard Arduino boards then you can just select that board from the Tools > Board menu, connect your ISP programmer, and then do Tools > Burn Bootloader. This excellent hardware package: supports any common hardware configuration and is easy to install.

I recommend reading this tutorial: