Step 1) Build a time machine. This is definitely the hard part, but I've already done it. I've outlined how to go about this in another topic but here's how I did it.:
Step 2) Use the time machine to make lots of money! But how? I thought about going back to the 80s and buying shares in Microsoft, but you never know if you might change the course of history and return to the present to find everyone using Apple Macs. So maybe I should go into manufacturing. What does everyone want? A time machine! Only trouble is, I can't remember how I built it. I was only following the blueprints and I don't seem to have them any more.
Still, I'm going into mass production nonetheless. Last week, on Monday I locked the time machine in a warehouse. I took Tuesday off. On Wednesday I used my time machine to go back in time to Tuesday, where I found the past version of the time machine sitting in the warehouse where I had left it. I sent this time machine forward in time to Thursday, then travelled in my own time machine to join it on Thursday. I then had two time machines. I took Friday off. On Saturday I used one of my time machines to travel back to Friday, to find the two I had left in the warehouse that day. I sent those forward to Sunday, then travelled in my own machine to Sunday to join them. There were three machines waiting there (the two sent from Friday plus the one I left sitting there on Saturday), plus the one I travelled in makes four. I took Monday off. Today is Tuesday. Later today I'll use one of my time machines to travel back to yesterday (leaving three sitting in the warehouse) and send all four of the machines that were in my warehouse yesterday forward to Wednesday, to join the other three. When I travel forward to Wednesday I should then have eight time machines. By next Saturday I should have 16, and 32 the following Tuesday. In three weeks I should have 512 machines, and in six weeks 65,536.
So you see, I've got the mass production set up. I just need a little investment to get the distribution underway. Anyone want to send me a cheque?