Depends on what you want out of the IRA and where you are in your investment life. I'm assuming you are new to is, so forgive me if I'm wrong. If it were me, and I was new to investing, I would invest in index funds to get my feet wet. I would figure out an "Asset Allocation" and put x amount of money toward each of those funds every week or whatever your investment period is. Sorry if you already know this but an Asset Allocation would be if you said "ok I want 50% in large company stocks and 50% in international company stocks. I like some diversification". Just a simple example. You go on to Vanguard, Schwab, or Fidelity or wherever and take that $100 and buy $50 worth of Large Company Index Fund and $50 worth of International Company Index fund. Then just rinse and repeat every investment period. Buy a little bit more of those two funds.

If you really want to do individual stocks I would invest in different ones. Not just all your money in Netflix every month.

Now $100 is probably not enough to start investing with. Say you had $1000 to start with and then $100 every week. That's what I'd do. I would not go after individual stocks for a little while until you get the hang of things.