im not going to sprawl out into a discussion, i'll just try and answer your questions quickly, to the best of my knowledge:
1) yes, wingchun is perfect for simple attacks, its fast, direct, and allows you to control your oponent very well. Most of its simple and beginner techniques are aimed at stopping simple attacks such as a haymaker or a left right etc... Although as seen in the UFC, there isn't much you can do against a good tackle, expecially if the person doing it is a decent streetfighter, which is where at least some BASIC groundfighting techniques can help you...
2) you should become proficient enough with a couple of lessons a week 2 - 3 at winchun in about 3 - 6 months, but most of your confidence will probably kick in about 1 or 2 years later (similar to other martial arts, including thai kickboxing)
3) you should ask the sifu what style of wingchun they teach, what the lineage of the style is (who passed it down to him and so on) and also the costs of the school. If possible always request a demonstration, trial lesson, or try and have a look at some of the experienced students (as this will help you gauge what you will be like later on) Try and look for things such as the quality of the instruction, and whether or not they do much realistic training - intensity, and maturity of the training
4) wingchun can usually stand on its own, but in this day and age, with more experienced fighters and so many martial arts schools, i would recommend a ground fighting style, mabye just the occasional lesson of your brazilian jujitsu, to help you out if things head to the ground (the last place you want to be in real life)
5) wingchun is brilliant for multiple oponents, although its also important to think about positioning and tactics (not taught at all wingchun schools) try and position yourself so that you can observe all of your attackers at once, so that they cant get the jump on you - multiple oponent fighting should NEVER be encouraged, anyone who has been there will know why, its a very hairy experience in 99% of cases. Wingchun however will allow you to control and attack your oponents, and depending on your skill, dispatch of them effectively (although in real life people tend to take MUCH MORE punishment than you are led to believe in training - expecially by most sifu's who dont fight outside the place they teach)
6) there are controlling techniques, mainly based around the trapping of your oponents elbow, and attacking his balance. You will find these controlling techniques are much more effective and aggressive than any others out there for standup fighting (in my opinion)
7) HONOLULU? can't help you there
(All of the above is my own personal opinion comming from my martial arts knowledge and first hand experience on the streets)
When fear is removed, the arrogance
of uncertainty is dispelled.
Therere, it is no longer necessary to
prove yourself in any form of combat.
By learning how to fight, you learn how not to fight.