You decide on which fund you want, open an account with the appropriate mutual fund company (e.g. Vanguard) or a brokerage, transfer to them the money from your checking account, and put that money into the fund.
You decide on which fund you want, open an account with the appropriate mutual fund company (e.g. Vanguard) or a brokerage, transfer to them the money from your checking account, and put that money into the fund.