It’s always a good idea to get a good soldering iron!
I see a lot of people that will go out and buy the cheapest soldering iron from china they can find, not knowing that in a month it with be almost completely useless. It’s not going to save you money in the long run when your UAV (drone) comes crashing down because of a bad solder connection (It happens). Plus when you have a high quality iron it makes soldering way easier and sometimes even fun! You can get one from the hardware store but I would go with eBay or Amazon for better prices.
Whatever iron you get, make sure it has adjustable power output and high quality solder tips.
Now they lowered the price to $90 Weller WES51 Analog Soldering Station
Here’s some good solder Alpha Fry AT-31604 60-40 Rosin Core Solder (4 Ounces)
Some heat shrink tubing 127 pc Heat Shrink Tubing Sets Assorted Size e/Case
Helping hands are nice to have also TEKTON 7521 Helping Hand with Magnifier