Are you not going through the insurance company, may have been your fault but i imagine your excess will be less than the cost of the repair, dependent on your age, excess you have agreed and NCD and if you have them protected.
Get VW or a VW approved body shop to have a look at it and give you a quote. I wouldn't worry about part numbers as they will have all that when they enter your reg and as mentioned, only OEM parts will do.
Even if you do buy all the parts yourself and fit them, you will still need a front end respray(excluding bonnet), probably £300+
Hope you get it all sorted