I'm confused, should I buy foam and electronics separately and build my own, or should I buy the starter kit. Also what type of hot glue gun do I need. The one at my house is only 10w
10 watts is a low temperature glue gun. I like to use a 200 watt one, specifically, the Ad-Tech Pro 200. It costs less than $50. I think you could probably use the one you already have.
For buying a speed build kit vs scratch building your first plane, both are options. I enjoy scratch building, but using a speed build kit can save on time, and ensure that all the parts are cut out correctly.
Buying a FliteTest Power Pack will get you most of the electronics you need, without needing to worry about soldering connectors or checking compatibility. It will be a bit more expensive than buying the cheapest options individually, but they are good quality parts. You'd still need to decide on a receiver, because that depends on the transmitter you buy.
If
@JasonK 's "getting started cheap" guide is any indication, this is an extremely competitive option to
@PlanesAndThings 's recommendations, and it reduces the risk of buying the wrong parts.