man power supply on piece rate basis

Need clarification on following alongwith section/rule reference

1. i am a manufacturing company and i have engaged few labour suppliers for supply of labour on piece rate basis for performing loading and unloading activities and packing activities. all actvities are performed under their supervision and control. they are paid on piece rate basis.

my query is
what is gst rate applicable for bill raised by labour supplier. whether itc is available to company.

what is assessable value for gst rate.

what if we also get man power supply for house keeping activities. what is the gst rate and AV and ITC availability.