how do you configure LTM ?

Take a look at the LTM Essentials series on F5 University. https://f5.com/education/training

This is also a good training series videos on LTM licensing and configuration basics, this should help you with basic LTM configuration. (https://www.youtube.com/watch?v=4mRGF_nBht4&list=PLjsSoP29dLx5XTH1Ksa_Sr99TSbqQNLny&index=1)