Goose said:
Im sorry if im being vague, just kinda want some general advice please. Thank you
First off, it's important to define what sort of summoner/conjurer you want to be. If you just like having armies of underlings around, necromancy and calling spells are what you're really looking for, not summoning, since summoned monsters only stick around for a short while. That said, these are your basic options:
Sorcerer (surprisingly good for calling, since the planar binding spells require high charisma)
Cleric (allows you to heal/buff as well as summon. Arguably the most powerful.)
Conjurer (I strongly recommend the Rapid Summoning variant, without which casting a summoning spell takes 1 turn)
Druid (spontaneously convert spells into Summon Nature's Ally . . . not so hot if you know that all you want to do is summon anyway, but it gives flexibility)
Artificer (allows you to buff and nuke as well as summon, but requires lots of prep time. With sufficient preparation, more powerful than even a cleric.)
In terms of prestige classes, the aforementioned Malconvoker is worth looking at, but so are these:
Thaumaturgist (bonuses to what you summon)
Nar Demonbinder (the calling diagram is helpful)
Master of Shrouds (summon undead)
True Necromancer (desecrate aura works to boost summon undead)
Moonspeaker (bonuses to summoning for shifter druids)
Surprisingly, most of the BoVD/BoED prestige classes are not actually that great for summoning high-powered monsters, at least AFAIK. There's also an Abyssal Heritor feat in FF that allows you to summon a demon once per day of up to half of your class levels in CR. At low levels that means cannon fodder; at high levels you can get something useful like a succubus or vrock. Of course, you have to be evil to really make use of that.