If you envision yourself as a trader, you'll want to look for a broker with very low execution fees, as high trading fees could quickly eat up your returns. (investopedia.com)
** For US government bonds there is an additional external execution fee of 0.0004 % embedded in the price. (home.saxo)
There will be costs and fees to pay (other than trade executions fees), which may or may not eat into a sizeable chunk of your budget and / or winnings. (valuewalk.com)