Purchasing Module in SDP: Do you use it?

I'm curious how many of you actually use the Purchasing Module in SDP. When it comes to helpdesk tickets I'm comfortable with making SDP work. But purchasing...is something new for me. To make it even worse my management team is like SDP has a Purchasing module, let's use it! Our billing team is still keeping track of purchases with an Excel spreadsheet, let's move them over and start tracking purchases in SDP. Well...on one hand this is great for me as it means job security. On the other hand...I don't even know where to start. And when they sent me a copy of the spreadsheet their using...I'm like oh man, what have I got myself into here? And can it be made to even work?

So...I'm curious if any of you have actually put the purchasing module to use and if so, did it work successfully for you? Any feedback of any kind would be very welcome.

Also if there are additional resources I can look at that would help me brush up on standard corporate purchasing from Net 30 terms on down it would be helpful. I'm literally starting from almost nothing with a blank purchasing tab, this spreadsheet snippet they provided...and nothing else!

Respectfully,
JamieMK