Please be extremely careful with this you can end up in extremely large court battles over images on the internet. Just because you can see it does not mean it is free to use.
By far the safest option is to take the photos yourself and make sure they are small files if you are uploading them to your website. If you have taken it with a digital camera, the photo will look brilliant but it will have a huge file size and take forever to load on any web page. Photos taken on smart phones or tablets are usually much smaller in file size but can still be further optimised.
The other option is pay a photographer to take some photos for you or purchase stock images.
There are some websites that photographers and designers contribute to and provide royalty free images under a creative commons licence one of the websites I like to use as a base to create or inspire is https://pixabay.com but please be careful and check to make sure you understand the terms and conditions and check that the licence is creative commons public domain.
I you do have any images that have extremely large files sizes I am happy to optimise them for you if you can bring them over on a usb as you probably wont be able to email them. Depending on their size you maybe able to use dropbox.