Contact, Order & Invoice Db For Small Business

I've been playing with the Northwind db to see if I can alter it to work a customer, order and invoice solution for my wifes business.

All I really need is customer contacts, order details and invoice generation from the order. (purchase orders, inventory, tax, shipping details all not relevant).

The more complex bit for the order is that her business is mostly mix&match from a range of products (wedding/bridesmaid stuff). So one order might be for 3 bridesmaid outfits, each outfit made from 6 options. e.g.

Bridesmaid 1. Top A(size 14), Straps B, Accessory C, Fastening D, Skirt E(size 12), Optional Item F.
Bridesmaid 2. Top A(size 16), Straps B, Accessory C, Fastening D, Skirt E(size 14), Optional Item F.
Bridesmaid 3. Top A(size 10), Straps B, Accessory C, Fastening D, Skirt E(size 10), Optional Item F.

Each item has a price, so the total price per outfit is sum of these. Price for order sum of outfits.

The invoice should show 3 outfits with detail and total prices.

I was thinking of either adding some parts from Northwind to the basic contacts db rather than trying to cut out the 70% of Northwind I wouldnt need.

My access abilities are best described as rubbish, does the above sound vaguley feasible for a novice? Or should I just pull my hair now in anticipation?

thanks for any help