they do NOT work together. you should read the help tutorial (sigh. seriously.)
all work experience does is allow you to get promoted. if you have level 5 work experience, you may be promoted to career level 5, and NO FURTHER. once you level up your work XP, you may continue
certain careers give more points than others, such as athletics and politics. this is mostly due to the fact that their main attribute (endurance and reputation, respectively) has a VERY low conversion rate, and they also have high requirements to promote
when you promote a level in a career, you will increase your point range. just as an example, lets say youre military like myself. at level 1, you get 1-6 points per hour, at level 2, you get 1-7, at level 3, 2-7, and so on and so forth. it IS NOT exactly like that, but that is basically how it works. the minimum and the maximum allowances keep increasing with your promotions
if i can find the link in gen discussion, i'll show my thread where i calculate it for you in the long run
http://forums.awakenedlands.com/showthread.php?tid=2839