Doubt about minifigures of LEGO Star Wars on BrickLink not having accessories like weapons
As you've noticed, the Starwars Minifigs don't come with accessories - this probably makes it easier for the sellers and buyers in terms of sorting: for example the battle packs often came with 3 or 4 different characters along with 2 different weapon styles - there's no definitive "this character has this style of weapon".

The weapons can be found using the Parts - Minifig, Weapon category - there are (at present) 4 guns tagged with (SW), as well as the various different lightsaber hilts (listed as Weapon Lightsaber Hilt), various generic weapons (pikes/spears) and the newer "Shooter Mini with [...] Trigger" that is appearing for more play value over authentic weapon styles (another reason why you might want to buy the weapons separately).

In terms of lightsabers, the beams themselves are listed as Bar 4L (Lightsaber Blade / Wand) under the Bars category (there's also Kylo Ren's Bar 4L / 2L Crossed).

If you're after more "realistic" weapons, then third party producers may be what you're after. BrickArms do a nice line in Sci-Fi weapons that include Han's DL-44 and the Imperial issued EL-11, DC-15, DC-15S and D9-AR.