Try looking at the family trees of brugmansia at BGI and ABADS brug registery. Look in the galleries as well. Note what kinds of brugs you like-keep a notebook. Think about what you want to cross for, tendrils, shape, doubles, colors, fragrance, hardiness, etc.

Both of the forementioned societies have pollen banks or you can also trade for pollen. So really all you must have is the mother plant also known as the pod parent.
You can also save your own pollen by removing the anthers and letting them dry a few days on a paper plate and then storing it in the freezer in little ziplock baggies or tubes etc. It should keep up to a year in the freezer.

Back to crossing...know that white genes are usually dominant. Knowing the genes of the brugs you want to cross, and which brugs pass certain traits along to thier offspring is the tricky part. Look at the crosses and who the parents and grandparents are can help too. There are some brugs that are considered true pinks, true yellows etc. because they have pink or yellow ancestors and have had most of the white genes bred out of them, so to speak.

Certain types of brugs do not normally cross with others for example, sanguinea does not normally cross with insignis, aurea,candida, versicolor,suaveolens. But it can cross with arborea, flavasanguinea, and vulcanicola according to Preissel's book. There is a chart in that book that illustrates this.

I think most hybridizers have started out just crossing brugs they like and see what happens.

Some plant hybridizers (haven't seen anyone fess up to it in brug hybridizing~but who knows) use charts or punnet squares to figure the percentage of what genes will be expressed in a cross. I am planning to play with it and see what happens though :)

Thanks SJN. That helps a lot. I have gotten some great cuttings this year and have bought a few things off ebay. I should have some nice things to play with next year. It had never crossed my mind to try my hand at pollinating until I have seen all the beautiful babies on here. Now I would like to try and make a special one of my own. I have a lot of studying to do but appreciate the advise of the wise ones here :)

email me your address and I'll send you a little extra pollen I have:) Hopefully RA or someone can add something to your question too.

Thank you so much. I can't wait to try it. I sent you an email thu GW. If you don't get it email me directly and I'll send it to you.