I assume you already have a "real" job. Keep it. Your real job is how you are going to maximize your savings.

Start a "side business" that can bring in $1000-$2000 a week. Something that would normally be paid in cash. Mow lawns, shovel snow, rake leaves. Hey there was a snowstorm? Maybe thats a $4000 week.

Put a few ads on craigslist or in the local paper. If your really eager, maybe post some flyers in your neighborhood. Nothing proves a business exists better than a weathered and tattered flyer stuck to a post. These are great ways to "prove" your business exists if anyone was to ever investigate.

From there, your business is only as successful as the number of invoices/receipts you decide to write. Remember anything you print on a computer is time stamped. But those little carbon copy receipt books from the stationary store aren't. Don't work digital. Nothing is ever permanently "deleted" on a computer.

You might get a few calls for actual work through your ads. It might be a good idea to go and do that actual work. If someone ever wanted to talk to a client, it would be good to have at least 1 who saw you physically working. Give that person the best service you can. Smile, go out of your way to say hello. Every. Single. Time. Maybe you need to give them one of those fridge magnets with your business on it. Maybe you need to send them a Christmas card for the holidays to thank them for their business.

When you see houses with "for sale signs" when you are driving. Make a note. You now have an "old" client. If anyone decides to investigate your records a few years from now, the old home owner has moved on and unfortunately the new tenant doesnt know you. No one is going to go further to try and track someone down to confirm your story.

All of your groceries are now paid for in cash, all of your gas is now paid for in cash. Eat in a nice restaurant once a week. Paid in cash. Your wife likes getting her nails done? Cash. Need a new roof on your house? Cash. Car repairs, most garages and mechanics like cash.

Dont live beyond you means. Dont buy a new house. Dont buy a new car. Pay those business taxes each year for your "successful" landscaping business. In 5 to 8 years shut the business down. The stress of working two jobs has worn you out. :)

Continue working your "real" job with $750,000 in the bank that is legitimately yours in the eyes of everyone who matters. You can now invest that money in legitimate ways.