Buying a bass guitar?

ive never played bass before.. but ive played guitar for about a year. im improving quite a bit and might want to try bass.. i just got a few questions:

whats the difference between a p and j bass?
how much money should i spend to get a good bass?
is it too early to buy a bass?
any actual suggestions?

i was looking at this one:
http://www.clubbass.ca/instock/FLPB.html
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