no doubt Dave's approach is preferable at an early stage - handshake might be OK but if the company has huge prospects, then getting it tight and right will constrain any squirrelly behaviour later on - or at least enshrine it earlier :)
1. It depends on the investor type, number of share classes, vetos, majorities, supermajorities etc. If the investors are institutional they will be seeking to make sure the investment is well protected and that means:
a) top-end of town lawyers
b) more billable hours for (a)
2. Then it depends on how well you locked down the term sheet. If there is argy-bargy, then do this at term sheet time otherwise the lawyers in (a) love dreaming up fantasy scenarios to further their quest for (b).
Lastly, most institutional investors expect the company to pay their legal costs if the deal consumates, so you should aim to cap that.
So, for an aussie company with a simple investor group $5-30K.