what do i need?

Some use hot melt and some use two part epoxy. Hot melt can be warmed back up for replacement/adjustment while the epoxy is sometimes a forever kind of deal. I think one of the biggest things is to clean the inside of the shaft and the outside of the insert with 93% or better alcohol or a little acetone on a q-tip. Most say not to apply heat directly to the shaft if using hot melt but rather to a field tip threaded into the insert that will be used to push the insert into the arrow. May not be the best way but it works for me.

Goat tuff or similar works wonders and is easy.
Simply tap all debris out of the arrow, apply adhesive to the base of the side of the insert and push into the shaft while twisting to get an even spread of the glue. Don't waste time doing this because the glue will be set within 15 seconds.

If you dont want the inserts to come out, try Gorilla glue. Doont go crazy with it, just a light coating as it expands and you'll thank me for it later. :)

Buy some Goat Tuff adhesive glue. Is expensive, but it is the best I have ever used for fletching and gluing anything else and will never use anything else. Put a little bit of glue all the way around the insert. Push hard to slide it into the arrow all the way and then roll the end of the arrow with the insert along a paper towel to get the excess glue off.

Loctite Gel Superglue. Inexpensive easy to find, and great. I use it for inserts and fletching. Try to get a .243 brass cleaner from a rifle kit, and clean the inside of the arrow first. I like to then use a bit of alcohol on a Q-tip to clean it, let it dry, apply the glue to the insert, twist it in as you go, then put a broadhead in and spin test it to make sure the insert is inserted squarely.

i went to gorilla epoxy and havent had any slippage