Hello Anvita,
You say that you have problem "including images in the lessons". You should understand that lessons and quiz are 2 completely different activities in Moodle and that if you have problem in lessons you need to go to the lesson forum to find people to help you.
And also you should know that currently import of images in questions is not supported in lessons. It works when you import questions with images in a quiz but it doesn't works when you import questions with images in a lesson.
I have submitted some changes to make it working so maybe in a future version of Moodle it will work. In the meantime, you can vote for this feature here MDL-38560, MDL-38505, MDL-32870, MDL-38540. Very few people have voted for these issues so I don't know if a lot of lesson's users are interested in this feature ?
Currently Moodle developpers are very busy preparing the release of Moodle 2.5 but I hope that after that release Rossiani Wijaya, who is maintaining the lesson activity module, will have more time to review my proposed code and hopefully it can be integrated in Moodle.
that is of course if you are using a recent version of Moodle ! What version of Moodle are you using ?