Welcome to the hobby. I got a Shapeoko 4 last year and it is a great tool.
1) some sort of dust collection solution. I use a Festool dust extractor which is very expensive but also very quiet. Others use a shop vac. But you need something.
2) workholding. The Carbide 3D get a grip kit, some masking tape + super glue (C3D sells a kit), and double sided tape are all I've needed so far.
3) bits will vary based on what you want to make. I'd target having enough variety to get you started while you learn the non-trivial software side of things. This could be as simple as a 1/4" spiral, a 90 deg V bit, and maybe a smaller spiral like a 1/8.
4) some useful tools: a dial indicator (to tram your router), a digital caliper, some sort of sharp knife for various cleanup and other delicate cutting needs, and a flush cut saw to trim tabs after you cut out a part.
The fight pad frame has a thin indented line that you can run a xacto knife thru ( ill leave a amazon link below) so you layer it with the decals you can get the from amazon as well just type whaterver you want and the word "decals" after and you will see a few that sell 100count for $9.99.
The process
Layer the decals to fill space i suggest putting the ugly decals you dont want first and put the ones you do like last on top to show off the ugly ones are just to cover the area as the will become a background to the ones you put last. Then over lap the decals over the thin line around the frame of the fight stick and take the knife and run it down the gap to get that perfect cut and rinse and repeat.
As for the buttons just lay the decal over the button and the area you would like to place it then before peeling the back of the decal cut the round shape out of the decal then peal then place. Other than that be careful not to cut your self and have a trash can to throw the back of the decals aways smoke a blunt and have fun. And add fb_playerb on xbox so we can fight on a game good luck
X-ACTO #1 Knife, Z Series With Safety Cap https://www.amazon.com/dp/B005KRSWM6/ref=cm_sw_r_cp_apa_i_McFhDb8DTM7XA
100 PCS Dragon Ball Z Stickers, CATTA DBZ Stickers Pack Waterproof Removable Vinyl Decals for Laptop, MacBook, Bottles, Skateboard https://www.amazon.com/dp/B07SQ74R7W/ref=cm_sw_r_cp_apa_i_udFhDbAZD19S6
Sure thing! A high-carbon blade would be good to sharpen, but will dull easily and quickly. A stainless steel/HSS blade is incredibly difficult to sharpen, but will hold and edge for a bit longer.
I didn't get to look at your exact examples because I'm on mobile.
Again, I don't know anything about what's available in Turkey, but an X-Acto knife (craft knife, hobby knife, etc) has extremely sharp, cheap, replaceable blades that are amazing for beginner carving. I know you were looking for an all-in-one, but I just recommend this because I think you'd have a better experience, and here in the US you can get an x-acto knife with replacement blades for ~$3 if you buy locally. Amazon has onefor 3.82 without replacement blades. They're super nice knives because if you decide not to use them for carving (you either upgrade or decide you don't enjoy it), they still have a billion uses around the house. And since they're the size of a pen, they're easy and discrete to carry! I would mail you one if I could afford postage. :-P