ok to make it a HL model(make sure you scaled it to 1/4 the size of a regular HL model,used a skeliton,fixed the animation names in the QC,and have the animations)go to tools half-life and hit generate QC find the qc you changed and click "open" or double click it.walaa your model is done and ready for play.
P.S. :if its not an animation but the actual model than no you do not save it as SMD with sequence.(it would be easiest to finish this model if you use vegita's animations like i suggested many many times before)Cant wait til its done