Hello Lila,
It is hard to go wrong with any of today's black and white films, as there are many good choices.
Assuming you will be using a tripod for landscapes, I would recommend a medium speed or slow film. You could get a more modern look with T-grain films like Kodak T-Max 100 or Ilford Delta 100. If you are aiming for a more classic look, you could use something like Ilford Pan F+ or FP4+. That being said, you can get a range of looks from any film just using filters alone. I would recommend a yellow/orange/red filter for landscapes, and possibly green if you ever decide to shoot foliage close-up.
I know little about street photography, but Ilford HP5+ and Kodak Tri-X are both perennial classics for it (especially if a they are pushed a stop or two).
Starting out, you may want to use less expensive films such as those by Foma or Harman. That way, you will be able to learn the ropes without spending a lot of money on finding your style.
In summary: Slower films for landscape, faster films for street photography. There is no wrong choice in these categories.
P.S. Your English is perfectly understandable
Best of luck!