XRAY - Model racing cars

Hey guys i just finished building my fk05. Its the first touring car iv built for about 7 years and iv got to say the quality of the car is outstanding.
The only problem i had with the build was bleeding the shocks, after a few attemps i decided to just fill them up without bleeding. The instructions indicate that the shocks should be bled, however after pulling off the end caps to bleed them, the shocks filled up with air and worked like shit.
Can anyone give me advice on how to build and bleed the shocks properly? Is bleeding really necessary? And how does bleeding effect the cars handling as opposed to not bleeding them?????