Does this reel come preloaded with line?

No it does not come preloaded with line. You will have to buy your own line.

What size reel would be good for 7' Medium light rod?

I have 2 of the 4000 models on my 7 foot rods. They work like a charm. The 3000 would probably work just fine but I got the 4000s for the added capacity for long distance fishing from shore.

Can this reel switch from left to right hand

Mine does not. I have the 2000 series I can’t figure out why. I’ve owned plenty of spinning reels before and both Amazon and the instruction say you can. But when attempting to swap from left to right, there is no threading on the right side. The screw in handle is useless

What size reel is good for a 6'6 medium light medium fast rod?

I would go with the 3000. You can put 10lb mono or up to 40 braid. I wouldn't go that high though. If you go braid 20lb should be more than enough for that rod

KastKing Sharky III Fishing Reel - New Spinning Reel - Carbon Fiber 39.5 LBs Max Drag - 10+1 Stainless BB for Saltwater or Freshwater - Oversize Shaft - Super Value!

KastKing Sharky III Fishing Reel - New Spinning Reel - Carbon Fiber 39.5 LBs Max Drag - 10+1 Stainless BB for Saltwater or Freshwater - Oversize Shaft - Super Value!

Product ID: 265729936

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Details

Brand
KastKing
Hand orientation
Ambidextrous
Colour
Red
Material
Stainless
Fishing technique
Spinning

🎣39.5 lbs max drag power

⚙️10+1 stainless steel ball bearings

🛡️KastKing Intrusion Shield System (K.I.S.S.)

Description

🎯 Reel in the big ones with Sharky III – where power meets precision!

UNMATCHED DRAG POWER - Dominate trophy fish with a smooth 39.5 lbs carbon fiber drag system.
PRECISION ENGINEERING - Experience buttery-smooth retrieval with 10+1 double-shielded stainless steel bearings.
BRAID READY INNOVATION - Shark Fin aluminum spool lets you spool braid line without backing for maximum line capacity.
LIGHTWEIGHT YET RUGGED - Fiber-reinforced graphite body and oversized stainless steel shaft deliver strength without the bulk.
BUILT TO BRAVE THE ELEMENTS - K.I.S.S. water-resistant design keeps your reel protected from saltwater and dirt intrusion.

The KastKing Sharky III is a next-generation spinning reel engineered for serious anglers. Featuring a high-strength carbon fiber drag system with up to 39.5 lbs max drag, 10+1 stainless steel ball bearings for ultra-smooth performance, and the KastKing Intrusion Shield System (K.I.S.S.) for superior water and dirt resistance, this reel excels in both saltwater and freshwater conditions. Its braid-ready aluminum spool eliminates the need for backing line, maximizing line capacity, while the lightweight fiber-reinforced graphite body and oversized stainless steel shaft ensure durability and ease of use. Perfect for professionals and enthusiasts aiming to land trophy fish with confidence and style.

Specifications

Color	Red
Hand Orientation	Ambidextrous
Style	2000
Length	16 centimeters
Weight	0.45 Kilograms
Width	14 centimeters
Material Type	Stainless Steel Aluminum Carbon Graphite
Features	KastKing Intrusion Shield System (KISS), Shark Fin Braid Ready spool, Super Silent & Smooth retrieval
Batteries Included?	No
Brand	KastKing
Manufacturer	Eposeidon
Manufacturer reference	Sharky III-2
Package Dimensions	15.29 x 13.49 x 8.89 cm; 425.24 g
ASIN	B077JWF4CQ