I made a custom horse and a summon spell for it. For some reason, nothing happens when I use the spell, though.
Anyone got any idea?

Bump!
Anyone got any luck on summoning horses?
I'm suspecting it might need Papyrus help, but I'm absolutely illiterate in coding

Perhaps if you described the procedure you used, we could see where it's going wrong?

What if I uploaded the ESP?

Uhmm, the code should be sufficient

What code? I don't know how to code anything, including Papyrus.
I've done all this just with regular CK.

Make a copy of any spell, then make a copy of any MagicEffect. Get rid of the parts of your spell copy you don't want (LIke if it's a fireball, the big boom), add a script to the Magic Effect copy with these lines in it (in addition to the automatically generated header):

Event OnEffectStart (Actor Target,Actor Caster)
player.placeatme(Game.Getform(0x00068D07),1,false,false)
EndEvent

Place the effect in the effect list of the spell, and replace the " 0x00068D07" with "0x" and it should work.

Works best if the spell is a "Self cast" like a buff, since OnEffectStart requires a caster and a target

You shouldn't use http://www.creationkit.com/GetForm_-_Game like that. In fact, I don't think you should ever need to use that function.

Instead, set up a property (its type should be derived from http://www.creationkit.com/Form_Script, but not an http://www.creationkit.com/ObjectReference_Script or http://www.creationkit.com/Actor_Script and assign the appropriate value to it through the Creation Kit, then pass your property to http://www.creationkit.com/PlaceAtMe_-_ObjectReference:

Game.GetPlayer().PlaceAtMe(MyProperty)

Cipscis

Meh, It's the easiest way I could think of to get it to work without digging deep into coding with a total coding noob.

Even I, as a full fledged programmer, have been having trouble, as you no doubt have seen with my various problems with "WTF? Variables don't store values between calls?"

Redwood Elf, it didn't work.
I'm so frustrated with this I'm about to give up.

Oops...replace "player" in the above example with "Caster", sorry.