Generally, my suggestion is to find a good designer to do the design privately and pay the design fee. The price depends on the designer's level and his previous design scheme. If you like it, do it for him. The general design fee can be 5% of the project amount. 30% in advance
For the tooling, ask the boss who has been decorated nearby and let him introduce it. Generally, the boss who opens a shop often decorates and will be familiar with it.
For home improvement, go to the same community or ask the renovated community. Let them introduce you.
The price/performance ratio is the best and the most reliable. Generally speaking, the price will be higher when looking for a company. Quality is a matter of luck.