Of all the decisions, you make when starting a macro business environment, probably the most important one relating to taxes is the type of legal structure you select for your company. Not only will this decision have an impact on how much you pay in taxes, but it will affect the amount of paperwork your business is required to do, the personal liability you face and your ability to raise money. If you decide to start your business as a sole proprietorship but later decide to take on partners, you can reorganize as a partnership or other entity. If you do this, be sure you notify the IRS as well as your state tax agency.
For a start I would finish your website. At the moment it's just a splash page - not the kind of site quality clients are going to buy from. You need to use your website to create a compelling sales message, using your portfolio, some testimonials, and of course some of your best design work to grab their attention and not let it go. Without this, I see any traffic-driving effort as being largely a waste of time, and maybe even damaging to your business. Once a decent prospect has seen your site and decided that it's not up to much, are they likely to look again? Ever? You need to start with the basics and work up from there. I would also argue that getting out and about in your local area is far more valuable when it comes to getting work than internet marketing is - particularly for a lone freelancer. Best of luck with your business