Three runes that are of the same type
These are items that are exclusive to the class -- wands, sacred globes and scepters, barbarian helmets, scepters etc. are a ideal option, along with rings/amulets and items that provide a point to one of the students' abilities. Focus on nabbing these instead of bolts or other objects that can take up lots of space. You can maximize your profits and decrease the amount of trips back into town that you'll need to take.
Prepare to grind
Diablo 2 doesn't have an ending game like you'd expect from modern games. And in the end, you'll likely spend a lot of time on boss battles, where you repeatedly square off against the boss in order to collect better items. However, even before you reach the final stage, you may feel weak, which is why you'll want to grind out XP (and hopefully get some useful items) by repeating certain sections of the game. Tristram The Countess Catacombs in Act 1's the tombs of Act 2 and the Act 3's Council and many more are fertile areas to earn XP rapidly than you would normally; be willing to make your way through these many times.
As mentioned above, the Necromancer's ability to summon allies is vital in keeping some pressure off you. It's a good thing that everyone has the ability to solicit help without the need to join multiplayer. While you're progressing through Act 1 story, you'll gain the ability to hire your first mercenary from Kashya (one of those NPCs found in Act 1's Act 1 town, the Rogue Encampment). There are various types of mercenaries you'll be able to hire as you go through the story, starting with the bow-wielding rogues in Act 1.
Three runes that are of the same type can also be combined to produce an additional rune that is specific to it, or an item that can upgrade to the following level of rarity. The most important ingredient is to socket an item, an Hel rune and a scroll of Town Portal--this will remove (and completely destroy) anything that's in the item's sockets, allowing it to be socketed differently.
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