Don't sweat this.This is not an important or complicated decision. [I am not alawyer but I've been involved in and advised startups].
1. Incorporate as an LLC in Delaware.
2. Apply for a EIN (Employee Identification Number) with IRS as an LLC. It will ask how many members there are in the LLC. Make sure you don't put 1 [if you don't have a cofounder yet, you can include a close family member and give them a small stake].
3. If you have other income and you expect to put considerable amount of your own money (say > 20K) into the new business, then file form 2553 with IRS asking to be taxed as an S-corp so you can write off your new business losses against your other income.
4. If you don't have much income and do not expect to spend much from your pocket, then file form 8832 with IRS to be taxed as a C-corp.
5. If you and your cofounders have any vesting schedules, file 83(b) elections with IRS.
6. For seed rounds, issue convertible equity or convertible debt. This way, the entity classification is irrelevant to your seed investors.
7. When a real professional investor is ready to invest in your company, convert your Delaware LLC to the right entity in the right state. There are different types of conversions such as "asset transfer", "interest transfer" etc, with significantly different tax consequences, so hire a good attorney to advise you.
Here is the rationale. The entity type and state of incorporation are not irreversible. When you start, you don't have a great deal of time or money and your chances of getting VC funding is frankly not very high. So go for the simplest: You can create a Delaware LLC in 10 minutes for under $200 (including agent fees) with essentially one piece of paper.
Of the steps above, step 2 (making sure that you are not a 1-member LLC) and step 5 are the two important steps to take initially.
Step 2 is important because a 1-member LLC is treated as "disregarded" entity by IRS; having more than 1 member makes you a corporation (in IRS view) so you can choose S- or C- status which will make conversion easier later.
83(b) is important because it establishes the cost basis of your stake in the company so that every vesting event does not become a taxable event.
Everything else can be fixed later as your business model evolves and your business has more resources.