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your questions has3 parts and the answer will be divided into3 parts also.
1- Steps to build a MPLS network with Vrf lit?
VRF-lite is a feature that enables a service provider to support two or more VPNs, where IP addresses
can be overlapped among the VPNs. VRF-lit uses input interfaces to distinguish routes for different
VPNs and forms virtual packet-forwarding tables by associating one or more Layer3 interfaces with
each VRF. and you can use the following links for detailed steps to configure VRF Lit and Multiple VRF Lit
http://www.cisco.com/en/US/docs/switches/lan/catalyst4500/12.2/31sg/configuration/guide/vrf.pdf
http://www.cisco.com/en/US/docs/ios/12_2sb/12_2sba/feature/guide/vrflite.pdf
2- what is the global table in mpls network ?
it is the global routing table and mpls forwarding lable table, this tables is the defualt tables and it contains all interfaces thate didn't belong to any vrf
3- how address-family works in mpls network?
the address famillies are used to distangashe overlapped customer IP address and controle transfer of the customer routing updates between deferante PEs VRFs, you can check the following link for more details.
http://www.cisco.com/en/US/docs/ios-xml/ios/mp_l3_vpns/configuration/15-mt/mp-l3-vpns-15-mt-book.pdf
