Layering With the Background
Step 1. First Layer: The Backdrop
Use www.Google.com image search to find a light backdrop for your image. Choose something with light colors that won't overshadow any text that you might want to add later. Also, refrain from choosing a backdrop with too many contrasting items. They will take attention away from any text or images you may want to add later.
Right click on the image you would like to use and save it to your computer by right-clicking on the image and choosing "Save Picture As...". Save it to a new folder on your desktop so you can keep your work organized.
To open the image in Photoshop, run Photoshop and click on File > Open. Find the folder that you saved your image to and double click on it. Save multiple images of things you would like to add to your background image.
Using the default toolbar on the left, select the lasso tool highlighted in the image. Click and hold until a small menu pops up. Select the "Magnetic Lasso Tool."
Have the image of what you want to add to your backdrop in front of you. Click and drag the mouse, highlighting around what you want to cut out of the image.
Once the section you'd like to layer is highlighted, select Edit from the top menu bar and then Copy.
Click on your original backdrop image and select Edit from the top menu and Paste. If the object that you just pasted is not size correlated with your backdrop, go to Edit > Free Transform. A rectangular selection will appear around what you have just pasted. Click and drag the squares around the selection to resize your object accordingly.
Repeat this process with multiple objects that you have copied and pasted from the images you've saved to your folder. Each image you paste onto your backdrop will appear as a seperate layer on the bottom right window of your screen. This will allow you to edit any mistakes you've made to the objects that you've pasted. Also, having seperate layers means you can edit one object without destroying the others.
When you are finished adding objects to your backdrop, play around with the Photoshop tools. You may want to use various filters, a trademark tool of the program. Select Filter from the top menu and choose a filter to apply to your backdrop. Make sure the layer you would like to alter is selected in the bottom right window or else the filter may alter something else. If you ever make a mistake, select Edit > Undo from the top menu.
Right-clicking on the layers themselves in the bottom right window will bring up a little menu. Select "Blending Options" and play around with the blending. This will alleviate any awkward breaks or contrasts between your layers and make it look like a true backdrop. You may also use the smudge tool on the left toolbar. (Click and hold the finger and select "smudge tool.")