Your lightsaber's color is determined by the LED module that will be installed in it. 12W LED modules contain four individual LEDs of set colors - white, blue, royal blue, green, amber, red, red-orange, and photo-red. To obtain maximum brightness you need to pick a color made by running four of these LEDs at full power - for example, yellow is made by running two green and two red LEDs at full brightness.
The easiest option to have a bright saber with sound would be the Champion electronics set. This will get you a saber with a full brightness color and a sound set that is either light or dark side. If you choose the add-on Champion Assembly Package with your order the saber will arrive completed at your door step, no effort required but charging. Please note from the website:
This assembly package must be purchased along with saber parts emitter/switch/body/pommel and blade plug (optional).
https://saberforge.com/collections/asp-assembly-services/products/champion-assembly-package?variant=36438898506
The cost for that option in your saber would be ~$148 USD for your designed hilt with a blade plug and ~$250 USD for the champions electronics package, for a total of about ~400 USD plus shipping and any applicable customs fees. You can choose your lightsaber's color, whether you want dark or light side sound effects, and the length of the lightsaber blade you will get.
In terms of charger, Saberforge uses a 3A Lithium-Ion quick charger with a 3.5mm port. If you specify in your order notes, they should send you a European charger compatible with your saber.