Stock Market
Stock commissions from brokers is almost non existent. No way would I trade through a place charginig .15/share with a platform fee. That's ridiculous in todays environment.
Options usually have a per contract charge which is minimal. If you buy/sell an option you are controlling 100 shares
Look at a place like tastytrade for a full service broker with zero stock commissions and reasonable option commission. If you decide to go that route, let me know as I can give you a referral link.
Cash into an interest bearing etf/fund and use some equity to make trades.