Beginner here.
Pardon me for the obvious question.
But, what should my expectations be for the year or two?
What can be my sharpe, if i get lucky?
Losing and more than a year or two. Retail who only know how to program and not trade seldom ever make it cause you have to learn how to make money first, you have to continually add to your mental library every year and once you get one system automated, it is never ending of tweaks until you have traded through a few cycles or decades and recorded thousands of different climates until you have seen it all a few times. Will never see 911 cycle or Swiss France due to brexit until another one happens, but you bank the occasion and then solve so you have options on the next time and code it.
I never think about how much can I make, I walked away 8 years ago on making the most to how can I seldom lose and what is it going to take to do this, this is much more of a challenge as you will get many who say something can't be done which is more of encouragement to keep this path, often times people want you to fail cause THEY can't accomplish it, you have to walk alone closer you get to your goals. And gets very lonely cause you can't trust anyone as all can be more to of enemy cause all are trying to get better prices. Trading like a boxing match, in the ring you hate guy you fighting but you may respect them outside of ring.
Automation is what you put into it and there is much math in it even if just using trendlines, "NOTHING" is exact in the world, well maybe space vehicles, but there are small differences of patterns like ascending triangle, does the highs all have to be exact tick or can it be higher/lower by couple ticks, so your back testing comes into play. Before I get to stage of actually coding for automation, go through many process first to make you have edges first. I am very conservative so it might take 18-24 months from start of an idea to it real time trading. And never stop doing some type of manual trading, you will really lose it if you stop.
It comes down to your account size and only after you know your app is profitable, you never want to go more than a percentage of the account into the markets, anything can and will happen that is NOT in your favor at least once or fifteen times or more, very hard lessons but learn how to overcome before they happen, GoT to have the answers first before question and program it in. And you can hedge scalping or day trading but not in conventional ways/methods, and yes it costs to do so, but don't want to lose thousands cause something blow up. It like fire insurance on your house, you hope you never have to use it. When you start with small account you can make nice size percentages, as account gets bigger, numbers affect one's thinking.
Good luck to you.