The best way for anyone to do this - anyone with a limited budget, anyway - is to create a content website, based around some aspect of that business.
So perhaps your limo service website could provide lots of interesting articles about limos - the good, the bad and the ugly when it comes to limos, and maybe even the people who hire the limos.
If people are looking for this info, and there aren't already thousands of websites that provide this info, AND you write your pages well, then you'll easily get people to visit your website. And as these people are interested in information about limo services, the chances are they'll be interested in using a limo service.
Do you see how this works?
Now, as with all business ventures, you have to do your market research - i.e. you have to determine whether there is enough demand for your product and not too much supply. For online businesses that's called keyword research.
And you also have to work out how to create compelling website copy so that a) visitors can find your site and b) visitors like what they read.
And you have to be able to build an effective website or know someone who can do this.
It's ALL do-able. And it's possible that *can* source all of the above from different places, maybe, or you can just do some research on a service that's called Site Build It! that's been specifically created to do ALL of the above and more, aimed at experts AND beginners alike.
Just do a search on Google, and check out the free guide below, and see if Site Build It! can deliver what you want for your new business idea - I believe it can!