If you want something nice and easy just use 7 or so sine waves: All that matters is that the ratio of the harmonics "fans out", i.e. they get farther apart as they get lower.
Example for traditional Hemony bell in which F=Frequency of bell:
Third-1.2*F (That's a minor third up...you can get a non-traditional but more consonant sound by using a major third-1.25*F
A big part of synthesizing a bell sound is getting the amplitude envelope correct-very short a attack-short decay-long sustain/release. If you are using [adsr~] something like (5 80 0.2 1000) sounds fine.