I've registered many LLCs. It is very cheap, about $100, it's as easy as buying something on Amazon(don't fall for the Mark Cuban endorsed recurring bill fraud registration service, which charges you $500 a year to do what the SCC services include anyway, and, they take a week to do it if you pay for their "expedited" service, where self registering you'll get your first documents in minutes not days or weeks, I haven't even seen black hat recurring billing scams as bad as that trash), and then like $25 to register a tax ID for it(then, you can open a bank account for it, and get debit cards.)
I say yes, it's worth it for a business where you need clients. People will take you more seriously. Make business cards and business deck PDF, regardless if you've had any clients you just want to look professional.
Taxes and everything will be the same, though will be easier to separate your biz expenses if you use a biz account, and you could take out credit eventually and get a biz credit card, once you have a track record, and it won't affect your personal credit directly.
Personally, I never use my LLCs anymore, but that's because I just do affiliate marketing now. Dang bank of america charges me $30 a month per biz account, really need to cancel those accounts.