You wrote that you're on a student's budget, so here's some advice.

1. Call....slate, many reasonable and very functional models can be had for $14-$20.

2. Turkey load......any 12ga copper plated lead shot load 3", shot size 4,5, or 6. There are some smoking fast head vaporizing loads out there, but performance costs $. Federal or Winchester should do it. (3.5" shells are overkill IMHO)

3. Don't get hung up on decoys too much. They work, but there's a lot of hunters who swear the best place to put them in your garage or attic.

A single hen decoy facing me, at 20-25yds, 45deg off one shoulder works for me. Some guys use a single jake decoy, making it look like a jake's trying to sneak in silent.
A jake placed a few steps behind a hen on the ground, looks like she's squatting to be bred might get that ol'gobbler fired up.

There's more, a lot more but hopefully this helps.
PS...they're eyesight is as good as they say....that's no guff.