Can't think of any better advice to give you than to take advantage of the approximately ten step by step how-to demo's I have put together and archived here on Wetcanvas.
Plug my name "Seiler" in the homepage search engine, and about 64 pages will come up with links to those demo's....
There are a number of other artist's demo's as well, which you'll find by going to the Landscape content channel.
Here's a jump link for you to see one of my demo's done in oils, highlighting the materials..the easel I use, with even a couple mpeg videos you can watch. Its a plein air session I did last summer on the beaches of Presque Isle, several miles north of Marquette, Michigan off Lake Superior. Good luck! -Larry