thinkorswim normal rate for stock is 9.99. if you account funding is huge, can neg. for better commission pricing.

avoid CFD if possible for newbie. is an leverage instrument. if you really need to trade using CFD, get Direct Market Access (DMA).

interactive broker and thinkorswim (not known as TDAmeritrade) both regulated by Commission of Security and backed by government up to 250K per account if brokerage goes bankrupt.

buy min stock per unit. commission charge per trade. buy and sell the same stock considered 2 trades. get decent good US brokerage. commission is very competitive.