G'day Majorpanic,
The way I operate is:
• client briefing;
• quote;
• by enalrge as it's mostly gov' work I then get a verbal approval or it'll be a purchase order;
• present concepts (which are only started and left with them once an approval has been given
• client makes changes to layout (rare);
• present new layout or get 1st set of alterations, client is charged for alterations thereafter
• as 90% of my work is gov' I know I'll get paid within 7 to 30 days.
There are other bits but that's the guts of it.
Only had one client engage me who I realised were out to milk me so I cut and ran and chose to make a small lose than a larger one. All work is repeat business. Still I love what I do and I get paid for it.
As you pointed to the single most important thing is to give value by way of client service then they'll come back. Good clients drop a word in for you which means new clients and those new ones themselves by association with the first client have always been good clients in turn, the wheel keeps on turning.
And my boss won't sack me. :D