The thing is not to make yourself a superstar. I made myself up, gave me late 70's, a few low 80's and 8 weaker foot (I wish btw). Signed in my 3rd season, after winning Div 2 in my first and Div 1 in the second. Developing very nicely, along with a few young superstars that I'd never even heard of! One's gone from 85 technique to 96 and still improving!
Also a suggestion for anyone who doesn’t like the fact the Cristiano Ronaldo / Adriano /Robben etc have shite development charts even tho they are getting better in real life and will probably become 3 of the best players around! :
Go into the edit section and create a new player. Base copy the player you want to give a better development chart. Now you have 2 choices, remembering that the player will be 18 and have an amazing chart:
1) Leave the players stats as they are
Or (my preferred option)
2) Take the stats down a little (not speed) to make it a little more realistic.
Save the edited data. Player will now be available on the master league.
Warning: Although this will make the edited players very expensive to pay. Need around 3500 - 4000 point in wages every season. However, it's satisfying knowing that the C.Ronaldo or whoever you decide is developing at a good rate and not getting worse!
Enjoy!