Others might have more experience with building renovation and the like. Can't make that call.
But if you plan on investing $5,200/year ($100/week), consider opening a Roth IRA. You can contribute up to $5,500 / year into a Roth IRA, and the money doesn't get taxed again. In bad times you can even raid the Roth IRA for the exact amount of cash you put in - but any growth has to stay until retirement age.
Roth IRA is an account type. You still have to pick where to have the account, and what to buy. Just starting out, I'd go with Vanguard and their S&P 500 fund. The fees are very low and the S&P 500 covers 500 of the largest companies (Apple, Exxon, etc).