I am including the sites for Schwab and Fidelity because they are the two top service oriented discount brokerages. Even if not an account holder, you can do a lot of free research on stocks, mutual funds and ETFs. This paragraph applies equally to both sites.
If you want to invest in mutual funds directly with one company, I beleive they are one of the finest. Many of their funds are rated 4 and 5 star by Morningstar.
All you need to now about business entities, Registered Domestic Partners, and a lot of other things. If you need to file your annual statement of information for your entity, you can find it here.