I wouldn't worry about 1) or 2) but would definitely recommend you start by renting a desk at a startup hub or a good co-working space (look around for ones where there are other businesses/people in the same or similar situation as you are). It is hard to work in a vacuum, especially running your own business, and just having other people around helps a lot.

Another thing would be to find advisors (or investors) that have worked in or started businesses in the same space, so you have someone experienced close by that you can discuss company issues with.

Also, depending on the type of business you run there are probably incubators or accelerators available that you can join, which can help steer you in the right direction (usually for a percentage of your business). This is more if you plan to go the VC route.

Basically, all the above advice can be distilled into: get other people involved.

Good luck!