Ok, im at 5 HP now. The tip for people starting out, play "everybody allowed" citys. That way you can go on really tough missions with better players and get shitloads of HPS to bump your score (aslong as ur alive at the end you cash in, and i doubt the other players care if you fight alongside them or not).
This probably isn't new advice but i thought i would state the obvious.
“When we make some new announcement and if there is no positive initial reaction from the market, I try to think of it as a good sign because that can be interpreted as people reacting to something groundbreaking. ...if the employees were always minding themselves to do whatever the market is requiring at any moment, and if they were always focusing on something we can sell right now for the short term, it would be very limiting. We are trying to think outside the box.” - Satoru Iwata - This is why corporate multinationals will never truly understand, or risk doing, what Nintendo does.