We need to know if you're flying in economy, business or first class in order to comment on cheapest origin point.

The route is valid; if you read the sticky threads and rules you'll know that you're leaving several segments on the table, but that's your business I suppose.

You can leave the segments after the first one open-dated and phone the operating airline when you want to book a date. Note available seats on any given day may not be easily come by, so by open-dating segments you run the risk of not flying when you want.