Help newbie corporations/business (White Giant)

I am sort of new. I've played this game quite a few times. I recently started playing again. I have always needed some tips or any help on corporations/business. I am also looking for a common market on White Giant.

level 1 companies require lots of workers
get to level 2 or 3
good companies
level 1
service
build mat
chemical
oil
brick
cement
construction
vacation
aluminum
rubber
sulfur
potassium
minerals
cattle feed
plastic
steel

level 2
industrial equip
household
books
electric power

level 3
high tech any
air tran

pop boost some don't stay at 9mill stay above 60 live expec then at 25 mil go to 65 Life expect
build schools to 180
hospital 150
tran 135
buy upgrades
set trade strat to 10% up
set company supply to 175
keep a high utilization low unemployment
have your ed priorities on teachers first
then once you have that go to whatever low
be patient and wait
keep a high welfare don't be like corporate partner which has a low welfare
get rid of junk type companies
buy country supply a

make it 20 mil to pop boost
as for enterprise
you can just build and buy no labor restriction there but run at 155 supply quality if you have public or 175 with no public
run em all the same with the mass buttons
no individual tweaking.
if you can't get your labor move to somewhere else
move if acquire a company in a low welfare country
move if someone jacks up the tax rate
buy companies low sell companies high
only go for sell in space when you have a good finance
make all your countries enterprise your personal common market
only contract stuff you can't get like LA shells and LT shells or space goods