Please read

what should i set profit sharing and tax percentages at. my country is the united kingdom on fb and what should i set my educatio prioritys for each member

I'm still learning the economy part of the game but 35% seems to do justice for me. Profit at 90-100%

are you experienced tho i dont wanna set my profit to 90-100 then my country goes poor

Profit transfer is the percentage of the money made by the corporation that goes to your nation cash. Set it to 100%. You want all the money that corporations make. Corps are supposed to provide money for your country, that is the point of building them.

Tax = transfers (gross) profit to the country (before profit transfers) regardless of the owner.
Profit transfer = transfers net profit after taxes to its owners in the proportion the owner owns the corporation.

You should view your country as a business and therefor see your corporations as a tool in your favor. Transfer profit is all about cashflow. The less cash your corporations need, the more cash-efficient, so you want to suck out as much cash out of your corporations. Especially if you are not the owner.
Sidenote 1: Profit transfer somehow affects net profit negatively (i dont know why because irl it shouldnt). This is just an accounting consequence and does not really matter, however if you want to IPO it does matter, because market value is derived from net profit. So if you want to IPO, temporarily setting profit transfer at zero makes sense. Excess cash in corporations are eventually transferred to country