if with HFT you simply mean multiple automated trades per day, then I would say: Find a setup where you can learn trading live with the lowest amount of $ and time risk. So I believe brokers like Oanda have API's, where you simply can get data and post trades (if you know programming) according to your logic, and you can do trades with as little as $1.
And as to strategies: just google, there is plenty to find, maybe quantstart to start off with.
And as to strategies: just google, there is plenty to find, maybe quantstart to start off with.