You have to get more solid food, not only one.
Cheesecake isn't so bad one, but don't eat too much of it(easy to understand).
But from Cheesecake finds a lot of protein(:

You don't need to eat a real food at all on the same day as you eat only Cheesecake(experience is).

Nuts are good, and fairly versatile. They can also be transformed into a variety of forms (powder, paste) so they're easy to incorporate into foods.

I've gone vegetarian for a month on three separate occasions, mostly to try to lose weight. My advice would be to moderate dairy consumption, as it may ramp up significantly. Since it will probably be a substitute for a great deal of your protein, you may want to downgrade fat contents (I was drinking around three glasses of milk a day, and went from 1% to skim) since it's easy to overdo dairy.

I don't find it that hard to do, as a great deal of dishes have meat as an extra rather than a central part of the meal. I'd recommend looking into Vietnemese and Thai cuisine for some exciting ways to use vegetables. The main issue I've found with vegetarianism is that it's often boring unless you're a great cook (I am not), so look into disciplines that use a lot of spices.

You have a good/smart style to eat stuffs and drink milks.

aahhh

No I hadn't heard of them, we dont have it in the UK

:/

ahh well