Preparing spinosaurus model for rigging

Combining all pieces of body to single logical mesh (eyes, teeth, etc. will stay separated) and fixing connection areas, so to eliminate seams where cuts were; presume you want it to move like living being, not like toy?
Bringing model to neutral pose and making it symmetrical.
Fixing flat parts and all other and adding details.
Creating low-poly version of it with good topology.
UV mapping of low-poly version.
Baking maps and texturing (coloring).