Glad to see that you are getting out there and using your DSLR. The kind of "chip" as you call it is called an SD or SDHC memory card. This is what your camera takes. The SD / SDHC stands for (Secure Digital or Secure Digital High Capacity)This camera is 11 years old and takes 10 megapixels images. This is small by today's standards, so you can use smaller SD cards with this camera. Mostly people use 32 GB (GB = GigaByte) cards but you could use 8GB or 16GB cards fine. I'd suggest you keep clear of off brand cards, and stick with the better known brands such as Lexar, Kingston or SanDisk. I like those 3 but you can use any that you like. Prices are very low on the smaller memory cards so going with a brand name card is cheap.

The best practice to use when taking pictures is to format the memory card using the camera. Formatting is preparing the card to accept pictures by the camera for the camera. After you take pictures, remove the card, put it in your computers card reader, transfer the images to your computer. Do whatever you like with those pictures that are on your computer but be careful not to delete them or put them in a folder that you can't remember. Then put the memory card back into your camera and format it again. This keeps the cards filing system indexed and ready for new pictures.