Unless you are real savvy on financial matters then I would recommend you get a financial advisor and he can ‘steer’ you to your objective. Yes they cost, but if he’s making good returns for you, then I have no objection to him making money from it.
In my 20’s I set myself a desire to be retired by 60, I am now on target to achieve my retirement at 58 in 2020.
I set up investments and recently ISA’s every year and put regular savings away every month, the big one though was cashing in an old works pension for the lump sum value and re-investing in a private pension which you can draw down from the age of 55, whereas keeping in a works scheme will usually be penalised for early drawdown. You are then in total control of that lump of money and can draw down a monthly salary to your requirements. The money is then 100% within your estate too, so any surplus after you die all goes to beneficiaries.
After you retire you will probably require a larger salary for the first 20 years to pay for all your adventures, the last 20 years is just to pay someone to feed you and wipe your ass! 😉