Unfortunately, no, lenders don't give loans specifically for marketing/advertising.
And going back to your original post, without excellent credit and personal assets, you will not even be considered for an SBA loan. SBA loans require 30% of your cash needs coming directly from you. You will also need to show proof of previous applicable experience within your chosen industry (preferably managerial). And you will need to sign off on a personal guarantee.
The personal guarantee will be required from most vendors too.
While it's great to plan ahead and think big, it seems to me you're putting the cart before the horse. You start off saying you have formed an LLC then you say you need to set up the LLC. Why do you even need an LLC for an online web business? (That's a whole other discussion.)
You shouldn't need major funding for what you have in mind with your web business. First get that business off the ground (the website), then see if it's even feasible to grow it to the next level. First things first.
Sylvia Freelance Business Plan Writer