Just get an "ATX" power supply, they all have compatible connectors now. Get a model with 400 W (or more for graphics card)
Your picture of the board is all PCI-ex ports, for graphics card you're looking for the longest of them, in the middle. All modern cards use it exclusively.
If you plan on adding a card like Nvidia GTX1050 or 1650 (or AMD RX460 or 550) - those generally get all necessary power from the slot.
Mode advanced models like GTX1060/1660 or RX570/5500 require additional power connector - get a power supply with 500 watts or more for those.
Oh, and both graphics card manufacturers dropped native support for VGA monitor connector starting with GTX10** series for Nvidia and RX series for AMD. If you used that blue connector for monitor then you're going to need a digital connection instead: DVI or HDMI or Displayport. You're lucky if your monitor has an extra input, so you will need just a new cable, if not - look at newer monitors too