I'd start off with some free samples. You can then manipulate them and edit in or try and study what do they consist of and try to resynthesize them later - that depends on how much time and what tools do you possess
Anyway for any research you will need at least some examples to go from.
I did exactly the same thing not too long ago (boy did I underestimate the amount of work needed) For ricochet sounds I threw metal objects at different surfaces, containers and a fair bit of manipulation to make them sound more "over the top". I too at first was driven to recording all the audio myself as a challenge but in the end used a few sounds from freesound.org and various other places.
At the end of the day if it sounds right, it is right!
Also don't do what i do and over do the sfx, a lot of the time an audiences mind will fill in the blanks anyway so only a few ricochet sounds will be needed. The mix will need room to breathe. I didn't realise how much I had overdone it at first until I referred back to the original transformers clip and realised how minimal it actually was.
Edit: If you have Logic, space designer has some cool "warped" reverb effects which can give you that "peeeoooow" sound if that is what you are after.
Last edited by Alex Paul; 28th August 2013 at 11:04 AM..
Reason: after thought