Do you want PvP, trials (i.e. PVE) or just solo overland roaming, questing and occasional dungeon?

I am not saying this is the best (define best) but this should work pretty good for overland questing, public dungeons and soloing some easy 4man dungeons.

I assume you have no moster sets (yet) and nothing but class and weapon skills so I would go

An overland/dungeon/pvp set 3x jewelry + 2x body or 2xweapons, something you can buy at at guild shop, and a crafted set 3x body and weapons or 5x body depending on your overland set. Later you will use monster set on head ans shoulder slot, use something you fancy.

Sets I liked:
Spriggan's, Battlefield acrobat, Unfathomable Darkness, Shadow of the Red Mountain, Way of Fire (heavy), Bahraha's curse, Agility (only jewelry and weapons).

Crafted sets:
Night mother's gaze, Hunding's rage, Ancient dragonguard, Night Moon acolyte.

DW: Bloodthirst, Whirling Blades, Blood craze, Relentless Focus, Manifestation of Terror, Incapacitating Strike
Bow: Snipe, Poison arrow, Endless Hail, Leeching Strikes, anything you fancy, I would slot cloak maybe, Ballista.

Since you played Skyrim and you love sniping you prebuff with leeching and focus and open from sneak with Snipe spam and you likely finish at least one mob before they get to you. Then poison, endless, when they are on you, swap to DW bar, drop terror, and finish them off depending on situation. Bloodthirst is your spammable which also heals you, Whirling Blades for group trash. Use focus on proc on strong mobs, as well as blood craze.

When you feel more secure and have Fighter's guild line, consider using Shards as spammable and Killer's blade as execute.

Hunding's Rage and Spriggan's is the default good enough build, that will allow you to do a lot of things at a pretty good level.

Eventually, you'll want trails sets but you'll have to do trails first.