Will I have trouble moving photos from old Mac Book Pro (some were iPhoto before upgrading to just Photos) to a new one?

I have a mid-2010 Mac Book Pro now running 10.10.3 It has a virus no one can get rid of, so I purchased a new Mac Book Pro. The only thing I want from this old computer is my photos. My question is: will I have any trouble getting the pictures that were iPhoto pictures to the new machine? I only recently changed to 10.10.3 and the new 'Photos' version and I am worried most of my pictures won't get moved over since they were on iPhoto. Obviously, I don't understand all this computer stuff very well but I want to know what I am in for when I ask the photos to move from the old to the new (providing I can figure out how to do that!). Thank you in advance for any help you have for me.