OK... Here are my opinions on your points:
1) Start your porn modelling career by doing solo first then move to hardcore much later to pro-long your porn career and maximise your earning potential..
Yes, that isn't BAD Advice. Kinda true, especially on paper. However Id look at it more along the lines of that I wouldn't recommended anyone going to do anything for the very first time, to jump right in at the deepen... Just inccase it proves to not be the right thing for them to do, even if they thought that it would be a good idea... ie if your going to learn to ride a bicycle, first use stabilizers, learn to ride thing, build up some endurance, and take it from there. You dont jump on a bike for the first time and set out to compete in the tour-de-france !
2) If you're a new model who start doing hardcore b/g straight away then no photographer will be interested in booking you for solo shoots..
Again, kinda true, but that's more of the minority. In other words, a few will feel like that but its also a cash thing too... I mean, if a girl is doing full H/C and picking u ?350 a shoot, is she really going to be concerned that some guy who only shoots topless, at 30 / 40 per hour, isn't going to book her for a one hour shoot?
3) If you're a new model starting out in porn, don't do interracial as this will harm your porn career but you can consider it much later once your porn career is nearly over (i.e you've passed it)..
OK the 'BONE' of contention ! UNFORTUANTLY, in the USA, then, yes... This 'can' be true... However I dont think its really that much to worry about... In the UK, its pretty irrelevant...
4) Never accept an offer of drink from photographer once you arrive for shoot as he might spike your drink and rape you.
Depends on the shoot. A recognized, company or photographer etc, in a studio or location setting, with camera guys, other performers, make up ladies etc etc... Then dont be so silly...
One man, unknown, with a KODAK FUN CAMERA, in a travel lodge hotel room, who you've never heard of... Then OK... Perhaps this is good advice. But only in so far as to err on the side of caution... I dont doubt that it happens on extremely rare occasions, but in itself isn't something that should be too worrying...
However, all the above aside, Id be more concerned about the odd 'Rouge' photographer like OEJ talks about... Infact it would be better advice than all of the above if there as a way to identify, and make public the guys to avoid... But, unfortunately in the present climate where so many people want to slur another's name, and the fact that its a legal minefield, I cant ever seeing that happen...
Word of mouth is a good thing, between those who know each other within the industry... But not much use to someone 'NEW' which is really, what this thread is about