1. Finding and inserting them
pictures
Finding and inserting them

2. Different formats of pictures
GIF format is limited to 256 colors and is a lossless compression file format, a common choice for use on the Web. GIF is a good choice for storing line drawings, text, and iconic graphics at a small file size.
PNG format is a lossless compression file format, which makes it a common choice for use on the Web. PNG is a good choice for storing line drawings, text, and iconic graphics at a small file size.
JPG format is a lossy compressed file format. This makes it useful for storing photographs at a smaller size than a BMP. JPG is a common choice for use on the Web because it is compressed. For storing line drawings, text, and iconic graphics at a smaller file size, GIF or PNG are better choices because they are lossless.
JPEGs are for photographs and realistic images. PNGs are for line art, text-heavy images, and images with few colors. GIFs are just fail.

3. JPG
GIF
Type in Google Images Search Bar
DOG JPG
DOG GIF
DOG PNG
See the difference
PNG

4. Free pictures…photos Go to Google Images
Type Free Stock and the item you want to find
Under the search bar press the botton TOOLs and see the categories you can choose
from: Size, Colour, Type etc. These tools can help you make a more meaningful search.
Open the picture.
Press right button of the mouse and choose the option Save as. (before that make the folder where you want to save the pictures.)
When you want to insert the picture in the presentation choose in the menu the category INSERT and choose the option Pictures.

5. Clip arts
in the graphic arts, is pre-made images used to illustrate any medium. Today, clip art is used extensively in both personal and commercial projects, ranging from home-printed greeting cards to commercial candles. Clip art comes in many forms, both electronic and printed. However, most clip art today is created, distributed, and used in an electronic form. Since its inception, clip art has evolved to include a wide variety of content, file formats, illustration styles, and licensing restrictions.
The term "clipart" originated through the practice of physically cutting images from pre-existing printed works for use in other publishing projects. Before the advent of computers in desktop publishing, clip art was used through a process called paste up. Many clip art images in this era qualified as line art. In this process, the clip art images are cut out by hand, then attached via adhesives to a board representing a scale size of the finished, printed work.
Free websites:

6. Tasks
According to the comic you have created choose 5 items that you can find in pictures and teach them in your presentation.
Choose them 1. using free stock option and 2. clip art option. In the end you should have 10 pictures.
Incorporate them in the presenation
Record the pronunciation for them using Acapelabox and Audicity.
Incorporate it all in the presentation.