Photoshop First steps

As I haven't had much practise on Photoshop before I have a very limited knowledge, but this is what I do know.

Firstly you find a picture that you want to edit whether that be from google, or your picture library. Copt and paste this picture onto your blank piece of paper. to begin you will want to re-size your image. you do this by selecting the 'marquee tool'. drag a box around the area you want to use, right click and select the 'free transform' option. with this you should be able to rescale the image to any size you want. when you have reached the size you need you can click the enter button on your keyboard to restore the picture quality.
 You can also crop the picture using the crop tool, simply surround the area you want with the dotted lines and press enter, everything apart from the selected area will be deleted, leaving you with the part of the image you need.
The fill/paintbrush tools allow you to manually draw or re-colour part of an image by selecting the colour you want from the pallet and using right click. The paint bucket/ fill will fill an area connected to the pixel you select with the colour you have chosen, whereas the paintbrush will only colour where you drag your mouse.