What is the best way if I wanted to study Molecular Dynamic Simulations of 20 inhibitors with two different isoforms of a protein in a stipulated time?
Try NAMD (http://www.ks.uiuc.edu/Research/namd/) or Desmond (http://www.deshawresearch.com/downloads/download_desmond.cgi/) other options would be TINKER http://dasher.wustl.edu/tinker/
The choice depend on what system you work with. You can browse the internet and see which is suitable for your system. Personally I think NAMD is an easy program for beginner to understand and try by theirself. it is also free to download. A lot of tutorial and example are given in their website.