First Futures Trades Since 2008

I transferred some money from my Australian bank account to Interactive Brokers to do some practice trades. I haven't traded futures since 2008 and so just want to get used to doing trades again. I did 2 very quick daytrades, shorting the E-Mini S&P. The first trade I got out where I got in and so I lost $4.10 the cost of commissions. On the next trade I made 1 point or $50, so I made $46.90 net. I was very nervous while doing the trades even though I am trading with a stop that is transmitted at the same time as my order and is only one point above my sell price, so the most I can lose is $50.  The contract value is $130k (about my pretax annual salary :)), so short selling that much stock does make me feel nervous despite the stop. I've just got to get used to this again as I am thinking of doing more systematic trading again and doing it properly this time. When I traded before, I had lots of winning trades but my winning amounts were small relative to my losing amounts. If I can fix that I could trade profitably.