Prepare your character for rigging by unwrapping UVS it first, naming each piece of your mesh and setting each of them in a separate layer.
Hide all other pieces except for the body
Change shading to X-ray and Wireframe on Shaded.
Reference object in the layer “R”.
Go to Rigging - Open Human IK and Create skeleton- here you can add fingers and toes bones as needed.
Move, scale and fit skeleton bones to your character body. Work on the character left side and mirror to right side.
Convert Skeleton to Control Rig.
Next open outliner (window-outliner)
Select Character body and then skeleton hips- click Bind Skin icon.
Character mesh should be attached to Control Rig.
Repeat the process for other parts of your character; you can skin specific part of your model (example: watch) by selecting this part and then specific bone (Left Forearm) and clicking Bind Skin icon. That way watch will be skinned to the left forearms and other linked bones below.
Next you need to fix skin weights by Paint skin weights.
Select mesh first and next double click Paint skin weights icon to open Tool Settings.
Here you can select each bonne and check skin weight value and area it affects. You can replace default color feedback (smaller values are darker, larger values are lighter) with color ramp (from left -smallest value to the right -larger value).
Choose and set brush to your need and paint to add weights. To remove weights Hold down CTRL key and paint over selected mesh.
If you have overlapping meshes (dress over body) you need to fix those as well.
Keep checking your skin weights to the point that you are happy with them and then you can start animating your character.
Thank You.