Do not pay anyone else to manage your money. It will not save you money. Just remember that in a downturn, you have not lost any money unless you sell, so do not sell. It will come back up. If it doesn't, the end of the world is occurring, so who cares what happened to your portfolio?
Next you need to decide what type of investment accounts to invest in. If your residency program has any matching offerings, invest in those to get the match. Then invest in a roth IRA, as you are in a lower tax bracket and will pay next to nothing in taxes on this investment. Then you can invest in a taxable account.
Then pick your asset allocation. A 3 fund portfolio of Total US Stock, Total World, and Total US Bond will serve you well. Pick the ETFs or the mutual fund, it doesn't really matter. You will beat 95% of investors and 99% of financial advisors over just a decade. Pick an asset allocation, such as 40/40/20, or 50/20/30, or whatever you want. It doesn't so much matter what you pick as much as it matters that you stick with what you pick. You cannot know exactly which allocation would get you the most money until it has occurred, but you can know reasonably well that you will succeed if you just stick to it. You can put that same allocation within each of your accounts, or you can split it up so that your total across all your accounts is adds up. Since all of my accounts have low expense ratios, I simply do the same split within each account. Thus if I die early, my wife will know exactly how to manage her funds.
Finally, hope that once you start making attending money that there is a big bear market, then invest like crazy during that period. Bear markets (2008) are when the real long term money is made. Do not sell when the market "crashes", as that is the opposite of buy low, sell high.