My first try for a tree(Ground slam+ heavy strike marauder)

Pretty bad. There's no reason for you to re-invent the wheel, there are plenty of GS Mara builds around.
http://www.pathofexile.com/forum/view-thread/73072

Here's a quickfix of yours, even though you should look for one with ~20 pts leftover and not 9
Spoiler
http://poebuilder.com/#character/AAAAAgEAAdwB5wJxBLMFLQ48FCAUTRRxGJEZhRnpGjgabBv6JIskqiXfJy8ppTGeMgk0jjWSNug26TpSPfxBP0KOR35KfUrITeNOKlBHUeZYY1ivWfNbr18_YEthIWVNZp5nWGegapNr2WxGbmluqnJscql07XgNeu98u3zZhNmE74Y7h3aI8YzPkFWfy6IApBmkrKZXpzCnhKloqW6rxayqtC-18rZBvJ--ir6nwA_AGsEExYrG2NJN1e3dDd7B37_i6uNq45_kreoY7w7wH_Iv8932SPcy-Ov60vzF_o__0w==

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