@ Hani:
For the security of your trading and funds, we recommend choosing a broker that is already regulated by a credible international regulatory body, namely: CFTC, NFA, FCA, FSA, FINMA, MiFID, ASIC and FMA.
A credible regulatory body is one that has been tested and is internationally recognized, and imposes strict sanctions on brokers if they are found to have violated agreed-upon terms. The regulatory body is also responsible for the security of client funds.
Regarding LegoMarket LLC broker, please read this Q&A section.
According to the latest information from their website, it is registered in the country of St Vincent and the Grenadines, so it falls into the category of offshore brokers.