To answer your question, IMO you should build a rogue that is fun to play. There are many variations. I personally started with flintlock ricochet because an eternal dropped. Then my 1st Vacuus Scipio bow dropped so i switched to guidedshot.
If this is your 1st character and you have limited gear right now, IMO you should look for gear with plagued, blight, and toxic affixes. Use a weapon that deals moderate damage quickly, like ricochet or guidedshot. Those 2 main skills use little mana. Soon as you have some angelite, kyanite, and sapphire crystals, roll until you get +weapon dmg affix on your primary weapon.
If you go with a bow, look for a items with talent of fletcher. For either bow or flintlock, propulsion is a must so that you knock back nme. Relentless is also very good, especially with bosses or Epic+ nme.
If you go with a MH primary skill, max your attack speed with affixes (60%), also find gear with extra attacks and/or multi-attack. Keep in mind that EA and MA only work on your MH primary skill. You can also add mythstones to get EA or MA but Zenith is hard to find.
For PVE build, add some legend affixes like glasscannon (2-3 total). But if you use GC, your health will go down to 1 HP, so you’ll need to craft a sanctuary amulet to survive. Explosive is also a good affix.
Look for items with set items with defiant, masochism, plagued, vampire touch, pathfinder. Gear with elemental damage % is very important and more rare to find. Use calcite to change the element to the one you are using (poison).
Hope this is useful.
Here’s a top tier elemental rogue build for you to consider. I realize it’s not possible to craft this type of gear when you are new to the game, but it gives you an idea of what to shoot for, and how people achieve high damage.