A well start would be ordering a Clark TK22 or TK24 or Tk60 board. I suggest TK22 as is cheap and probably you will not use the advantages of the TK24/60.
You can order it from Clark directly
Welcome to CLARK MODEL or Ozarmour or wherever you want. Be sure it has the T55 sound. all the Tk22 have the same firmware but the sound included are different for each tanks.
You also need a 4/8 channel radio, I suggest the Flysky 8 channels
https://www.banggood.com/Wholesale-F...2-p-47904.html
You could get the Turnigy 9x at Hobbyking but the latest version looks like has been troubles when one uses several receivers.
Besides you could order a speaker like this, sold out now but pobbably will be in the next future or just a 3 inch speaker and you can buid the speaker box.
https://www.dklmrc.com/product/3dp_saitek_speaker
Also a 7,2 battery, I recommend a good NiMh 4000mA is good for a beginner as Lipo needs more knowledge.
I think it's a good start then you will receive more help if neccesary.