I second GeoffhHa's point. The same $10 that will buy you three individual stamps (with 1/3 going for postage) will buy you hundreds if not thousands in a kiloware lot. Topical lots will cost more for fewer stamps but still many times more stamps than buying individual stamps. Since you are only starting out, while kiloware might yield only a relative few on some of the topics you are currently interested in it will yield many others on other topics that you haven't yet realized you are interested in

And the ones that don't fit your present or newly embraced topics are still stamps and they can be sorted and saved by country and date to create the beginnings of a modest US or worldwide collection (depending on whether you buy worldwide or US kiloware--I'd recommend worldwide).
Study the kiloware threads on SCF so that you buy your kiloware intelligently--important when one has limited money to spend.
Study the topicals threads here on SCF. Go to the topical society websites. Study up. Information is worth dollars.