Jet, Crash and Steve came up with another all time favorite kit and it is an easy build and great flying machine.
The tools crash mentioned are nice to have, I don't have all of them but I get by.
This is a photo of the plane I'm finishing up right now, it's not a kit and it's not an easy build plus it's 1/4 scale so it's not small.
My main building tools are the exacto knife. I only used two blades but I sharpen them on a stone and strop, I strop them as soon as they show any sign of dull. T-pins, I have a couple of packs I have used for years. Clamps of different types I use a lot of but I buy them at harbor freight so they are cheap. A razor knife is great I have one plus a cheap cut off saw. Glues of course, I use a lot of CA and epoxy. That's about it. If you think you need something go buy one.
The number one item is my building board. Mine is old and made of pine but #1, it's flat!! Go through the list crash gave you and I bet you have a lot of it at home right now.
Later on a covering iron and maybe a heat shrink gun? Nice to have even if all you ever fly are ARFs.
Good luck to you and just holler when you need help!!