Hi, in response to your question about what kinds of paints to start with first... did you get the answer you needed? Have you bought your paints yet? Here's my opinion.
Every kind of paint has it pros and cons and what you end up sticking with will depend on your preferences. Watercolor, for example has the least amount of extra "STUFF" that you need to buy besides the acutal colors. But it is considered the hardest to work with because it is so transparent you rely on control as well as spontenaiety and all of your mistakes are hard to cover up. When watercolors look overworked, they just don't look as good. The shape of the brush stroke counts as well as everythings else.
It counts in acrylic and oils too, but with these you get to do and re-do until you're satisfied. I think acrylics especially need additional mediums to mix into the colors to help the flow and slow down the dring time. The comments I hear the most from beginners with acrylics is frustration over how fast they dry. The tendancy is to use acrylics as if they were watercolors, and the result is unsatisfactory. They will look skimpy if applied too thinly, altho you can use them like watercolors. (Yes, I know, everytime you say a rule in art is, blah blah blah, in the next breath you have to discount that rule.)
Ok, so oils... I happen to love the smells of linseed oil and turpentines, but a lot of people dont'. Acrylics clean up with water, oils with turpentine or mineral spirits. That alone can be a deciding factor. The slower drying time is luxurious altho it can also be frustrating if you want to hurry up and varnish a new painting and you have to wait 3 months.
There are other factors, but maybe that will be enough to help you decide. And also, sadly, the more expensive the color, the more quality pigment is in the tube. What I've done in the past is to get the best earth colors (series 1) that I can afford and scale back from there. Advice from a landscape painter. Other painters might suggest you do it the other way around.
Suggestion:
Go to some galleries, look around, see what paintings you like that are executed with which type of paint. What kind of effect pleases you the most?
Have fun and let me know what you decide to do!
Rebecca