Website Dev Process Fundamentals

Greetings all,
Doing some research/reading on web dev process, and there is a vast amount of info and gets a bit overwhelming on where to start. I'm a project manager in lr, and I'm pretty good in my niche field, but it's NOT anything to do with web/net.

I'm big on structure and planning. But never really done IM / site building in general (ok, done a site for a local club I'm a member of... but no need for marketing), I'm looking at this a whole different way... as a real business, so I really want to spend some time on planning my site(s) out as much details as possible (understanding this will be a living process and updating to adjust to the times) so that I can up/down scale for future project sites.

For me, having a dev/design process in place with milestones/timeline before I begin will help me overcome any confusion and distractions along the way. I’ve lived so long in Gantt thinking, I would like to leverage this strength the best I can, into manageable steps/phases/tasks.

I found this infographic (I’m sure you’ve seen it… but it’s attached) that REALLY resonates with me, and is how I really do think (top level) in a linear fashion. Yes, this is basic fundamentals, but what/how are you breaking it down into manageable steps… how do you do it?

Ok… Basic phases:
1. Initial Contact
2. Planning
3. Content
4. Design
5. Development
6. Launch

As I’m just starting out, I’m going to start with “Initial Contract”. Why might you ask? I may move into web dev for clients… hell I don’t know. This is also where I would see one would also start a project for one’s self… If you are your own client… what are you asking? I see this phase asking the purpose, goals, mission statement (charter) and the like.

Sorry for my ramblings, but will start off with “Initial Contract” first… then move onto "Planning" and so on. What is working for the seasoned members over time?

Thanks all and looking for any/all replies.

Doing some reading and thinking, the Initial Contract looks like it could also be used for a resign of an existing site. With that in mind, I'm thinking of including the following items:

1. Initial Contact
   1. Briefing
   1. Define the primary and secondary goals.
   2. List supporting features
   3. Appraisal of existing web site, IT systems
   4. Confirmation of owner and marketing objectives
   5. Budget indication
   6. Roles and Responsibilities
   7. Pilot Selection
   8. Initial timetable
   9. First draft web marketing plan

I basically scraped these, but seem solid enough to start out.

What am I missing... any comments?