Hello Larry.
Welome to the gang. I'd like to say you're in safe hands but you're not as we will hep you spend your money on things you don't know you need and also teach you how to get it all home without the family noticing. Indeed we're all rascals with a sense of humour.
I think many of the manufacturers I love and the suppliers have been mentioned but here is my list (and I limit it only to ones still in production) of figure and bust manufacturers: Alexandros, Andrea, Atelier Maket, Beneito (some of their latest figures come with resin scenery too), Best Soldiers, CGS, Castle Miniatures, Chronos, FER, Fort Duquesne, Fusilier, Historex, Heroes and Villans, Life miniatures, Mantis Miniatures, Metal Modeles, MMM, Model Cellar, Nuts Planet, Pegaso, Reede Miniatures, Romeo, Tommy's War, Young Miniatures. Scales vary as do periods but they all produce stuff I like,
For flats (limited experience here but I'm trying) I've only used 2D Figurines frun by Brian who is a member here.
As for Armour please don't forget Accurate Armour, AFV Club, Asuka (formerly called Tasca), Bronco, Dragon (much improved since 2005), Hobby Boss, Italeri, Meng, Riich Models, Takom. For details and barrels: Aber, RB Barrels, Jordi Rubio, Lion Roar, Voyager, Verlinden.
Suppliers I use are: Euromodels (here in CH great armour suppliers at fair prices), El Greco (UK), Historex Agents (UK), SK Miniatures. I also buy directly from CGS, MMM, Reede Miniatures and Tommy's War.
In terms of collection there are many ways of structuring this: what you feel like, specifics eras, specific themes e.g archers. This is purely a personal decision for you to make.
Hope this helps just a little.
Cheers
Huw