Just my 2 cents, but there are a bunch of really good cheap options on amazon.
I have been using these “miuzei” SG90 servos on all my builds with great success. they are bare bones 9g servos, but pretty dependable at that. You can get a 10 pack for less than 18 dollars prime to your door, making each servo worth about $1.80.
https://www.amazon.com/dp/B072V529YD/?tag=lstir-20
For power setups, I usually spend a bit more but have been recently experimenting with this cheapo a2212 combo I found on amazon. I was actually pretty impressed with how well it worked out, pretty good performance and power, and great durability. I have been running this setup on my FT Mini Arrow on 4s for over a month now, without issues. Top speeds nearing 80mph! This setup is 15 bucks with prime.
https://www.amazon.com/dp/B00E7LG85O/?tag=lstir-20
For receivers, of course it depends on what protocol you are running. I run spektrum so I found multiple options for around 20 bucks a pop. My favorite is a knock off of the ar6210 that has very little performance differences to the genuine product, at 1/3 of the cost.
https://www.amazon.com/dp/B0747QJS94/?tag=lstir-20
There is also the HK OrangeRX route. I have heard good things but I have never tried it myself.
https://www.amazon.com/dp/B07BSCV4H8/?tag=lstir-20
LemonRX Also has lots of good options in the DSMX market, many less than 20 bucks. I have tried a few of these with good luck as well.
https://www.amazon.com/dp/B01N03RESZ/?tag=lstir-20
Either way, with these electronics you will be off to a good start. I would reccomend staying with simple planes like the FT flyer, delta, and nutball, or the ft22 and other single sheet wings. It will make it less complicated, less expensive, and easier to learn on. Good luck!