But how exactly hard tooling is ? We have local makerstore here, they have CNC machine, so practically it should be not that hard (except to figure out where to get block of steel). Still I have no idea about texture patterns on plastic. But at least for color I can use pantone ...
Looks like for simple stuff people are using silicone molds, wonder if results are any good, but you cannot (or can?) CNC silicone so one needs an original to make a mold .. and to make an original one needs a mold ..
In addition to the (great) advice you've been given above...
An injection mold will generally cost between $5k and $20k for a relatively simple part. $5k would be having a mold made in China, and $20k would be USA or European pricing for a simple mold. By simple, I mean two pieces that open up to reveal the part inside. The part must be designed to be molded - draft angles on the walls instead of straight up-and-down faces. That detail (draft angles) is just one of hundreds of things that must be done to make a part easily molded (the knowledge rx8pilot was referring to). It is all too easy for an inexperienced person to design a part that can't be manufactured or can't be made cheaply. For example, square outside corners are no problem. Square inside corners are a problem - and to get them truly square, you need to EDM machine the corners at great expense. If a mold cannot be a simple pull-open style, then you are talking about a so-called "multi-draw" mold where there may be three or more pieces which come together to hold the part. Such molds get exponentially more expensive than a simple single draw mold. A large or complex mold could easily run $100,000 or (much) more.
The CNC machine at your local makerstore is almost certainly orders of magnitude away from what is needed to cut a metal mold. Molds should be cut from special alloys of steel, and accuracy is very important. The cost of the metal to make a mold could easily be a few thousand dollars, and to get a smooth surface (like seen on a drink bottle) means the mold must be machined to within tenths of a thousandth of an inch. Machines which are powerful and accurate enough to cut mold steel accurately and quickly are extremely expensive. I say "quickly", because the way to make your mold smooth is to use very small tools, like a ball-shaped endmill 1mm in diameter... which means you "step over" perhaps 0.25mm per pass. You are taking very small cuts - which means it takes a long time, which means you need a fast machine to get it done. Even a fast machine could take 50 or 100 hours to machine a part... a slow machine could be 10 times slower.
Here is a machine cutting part of a mold for a quadcopter
You can see it going over and over the mold, decreasing the step-over distance each time and increasing the resolution and surface finish. The machine doing that cutting is a few hundred thousand dollars.
Here is an even more complex mold being done on a Hermle 5-axis machine. This machine is quite a bit more expensive than the Datron is - likely more in the neighborhood of a million dollars for this machine.
As for patterns on the plastic - they are cut into the mold itself. There is a whole area of expertise called "patternmaking" and patternmakers are very specialized types of machinists who get paid a lot of of money. They are the ones who texture a mold to give you the various looks you are used to seeing on products (smooth, matte, glossy, dimpled, etc).