I've just got involved in a new startup and been offered a founder's stake. There are only 2 of us, she is based in the US, I'm in the UK.
Just wondering whether to form a company straight away, or wait until some point before launch. I guess the 2 most important things are to protect ip, and ensure I get my stake in the future.
Any advice on this?
You should probably vest some or all of the founders' stock (the usual time is 4 years) as a way of deciding in advance what happens if you split. It is a huge distraction to negotiate that later.
Don't incorporate as an LLC unless you don't plan to either take investment or sell the company.
You should postpone incorporating only if (a) you're still not 100% sure you want to start the company, (b) you're not sure yet what the stock allocation should be, or (c) you want to get funding soon from YC or some other investor who would prefer to start with a clean slate.
Use a lawyer. And if this is a startup, get one who works with startups, because the issues with startups are different from ordinary businesses.