To directly answer "What direction should I head to retire by 35-40?": Save as much as you can, as often as you can.
With a short time to FI, your savings rate matters MUCH more than your investing "direction."
I'm saving at least $1,000 a month and sometimes more so would like some advice/insight on if you were in my shoes what investment strategy would you use so that I could possibly retire early and maybe even provide a little additional income along the way.
The latter part of this last sentence is exactly the wrong mindset (no offense). If you're wanting to invest for FI, invest for FI. If you want to invest for additional income so you can buy more trinkets in your late 20s/early 30s, that's different.
To achieve FI in your 30s you need to be dedicated to letting your investments compound, but (more importantly, as above) also dedicated to adding as much as possible to them. Having them "provide a little additional income" means you are taking from them, not adding from them. Which means you won't hit FI that quickly.
A completely fine thing to do for many people, but contrary to the original question you were asking.
Since you seem to also be asking investing advice, it sounds like the best thing for you to do would be start reading some investing books (say, A Random Walk Down Wall Street and The Four Pillars of Investing).
And to directly answer what I would be doing in your shoes (besides my natural answer of Real Estate, though I'm getting away from that based on opportunity), personally I would be 100% equities. No good reason, IMO, to be anything else at 23 looking to be aggressive with saving and investing for the next 15 years.
Best of luck!