This is two separate questions. One is about funding a business, the second is about marketing. You will get much better answers if you keep questions to a single topic.
Then, provide more background to your question, including why you want to know. When Freedly experts understand where you are coming from, they can answer your questions much better. They can personalize answers towards your individual needs, otherwise we can only give general answers, and they might not fit your situation exactly.
On your first question, about help with funding, it goes right back to your purpose for being in business. Your best chance of attracting funding is theough some sort of social enterprize scheme. Philanthropists and governments are much freer with their funds if they can justify their investment on the grounds of supporting good causes. Personally, that is a great idea, but it does not suit everyone.
As a part time business, you are not going to attract venture capitalists, though you might be able to get a bank loan. This would need a good business plan.
As a college kid, you might be better looking to make friends amongst fellow students. There are bound to be one or two with some family money, so think about a partnership.
Note that each of these options involves giving up some control over your business or how you run it. That is why I say you must have a clear purpose for your life and for your business. Just because it is part time, you must take it seriously. The only exception to this is if you are definitely treating it as a hobby, but just accepting some small payments to cover costs.
Do it the right way, and you ave a small business with a plan. There is a completely different plan for a part time business to earn some leisure money, and a full time business to support you and your future family. If you are seriously thinking of the full time option, then you must prepare a buiness plan. That will tell you how much you need to fund it, and then you can look at each of the funding options I have described above.
The absolute best way, is to target your launch date for your full time business after you complete your studies. Then build a fund to cover the capital needs out of your part-time earnings. But, I must emphasize that such a business plan only makes sense if it suits your life plan. My freedom definition pathway allows you to assess what freedom really means to you. This should help you avoid a situation where you get fixated on wealth generation, only to find that all the money you have earned creates it's own trap.
Your second question is about marketing. shrewdies.com will guide you on the principles for managing the marketing of your business. shrewdies will focus on the technical processes for running a marketing campaign. Both these resources are aimed at online solutions for online businessess, but the principles of promoting your business offline are exactly the same as online promotion. You will need to spend time, money, or a mixture of both on marketing, and this should be in your business plan.