If you want to learn the basics of soldering, or just want to learn some more then this video by Bruce from rcmodelreviews will help you. It coverspretty much everything you will ever need to know about soldering stuff for your RC gear.
There are also a bunch of other great videos so be sure to checkout his YouTube Chanel!
If you have any questions or have other useful soldering videos then post them below!
Also if you are looking for a soldering iron here are a few suggestions