Welcome to the forums,
tisatashar.
You've chosen a project which we should be able to help you do. Are the two images the same size? Do you want parts of one on top of the other? Do you want to take parts of both and merge them into one image?
It would help us if we could see the images and then get a description of your goals. Could you open the two images in Photoshop, duplicate them so you don't make mistakes with the originals (File > Duplicate... and then close the originals), reduce the size so they are something like 450 pixels wide (Image > Image Size... ) and then save the resulting images using File > Save For Web... In the Save For Web dialog choose JPEG as the file format and 50 Quality. Once you have the JPEGs you could upload them to this forum and we could see what we were helping you to do.
Do be aware that entering the world of Photoshop will require considerable effort on your behalf. The entire language will be foreign and yet that is the only one we can speak when discussing the program. Your best friend will be the Photoshop Help menu and Google. Here are the PSG beginner tutorials...
http://photoshopgurus.com/tutorials_beginner.html