I wish to be able of getting to more then lvl 8, that and more challenge if possible

I try Dark Side of the Sword Coast, but I could not get it working,,,

If you want more challenging combat, try Sword Coast Strategams

I was not a fan of Dark Side of the Sword Coast. Unless it has been updated (and I played in probably 9 years ago), it has vampires that level drain you with no ability to get your levels back. Overall the story was 'meh' and just seemed liked recycled parts of the main story.

I do recommend that Party Banter Pack and Unfinished Business. Party Banter really brings the joinable NPC's to life (though I thought they made Imoen a bit too annoying).

I believe the tweaks pack will allow you to remove the level cap.