Wow...Thanks allot!
You even translated it, even if you didn't have to.
But anyway, the only stores that I found that sell camping gear are these giant DEPO stores that kinda sell everything, but camping backpacks, and the gear looks generic and well...too cheap. I'll try to search outside my city and see if I can find a specific store but I doubt I'll find anything, and will have to order the stuff online. But these prices are horrible...
How much of a problem is my height?
I don't expect to stand straight in a 1-2 person tent but the one you found looks big enough for me.
And I think I can find mattresses and sleeping bags my size. That only leaves a backpack.
HEIGHT: How much of a problem is your height? Well, for the Americans here (like myself), 2.01 m is 6 feet 7 inches, which is extremely tall. It means that you have to look for a long size in everything, especially the tent, sleeping bag, and backpack. Those do come in regular and long but long is harder to find.
TENT: You should be able to sit up in the tent. At your size you would be more comfortable in a three-person tent, but that adds some weight. Definitely not a one-person tent. Your feet shouldn't touch the end of the tent. If they do, the sleeping bag can get wet. Here's a great tent that is light, waterproof, easy to enter and exit, has good ventilation, and is cheap:
http://www.campsaver.com/alps-zephyr-1?gclid=CJftwouvi8YCFUIXHwodtyEARg
Here's that same tent on Craigslist in the U.S.:
https://providence.craigslist.org/spo/5066954687.html Iwonder how much it would cost to ship it to Latvia. It's one of the best cheap tents in the U.S. See full specifications at
http://www.alpsmountaineering.com/alps/products/tents/lightweight-tents/zephyr-2
BACKPACK: When you're carrying a heavy backpack (probably around 40 lbs, or 18 kg), the backpack MUST fit very well. The waist belt has to cover the hip bone and the straps have to wrap over your shoulder and about 3 inches (7.6 cm) down your back. This way much of the load is carried by your hips, which are strong. If the backpack is too short, the load is transferred to your shoulders, which is painful.
MATTRESS: The length of the mattress isn't as important. It doesn't matter so much if your feet go off the mattress a bit.
COST: In the U.S. there are brands of gear that are much cheaper than others, but still good quality. You should try to spend as little as possible but make sure your equipment will be comfortable and safe. That means a tent that's truly waterproof, for example.
QUESTIONS:
1) What is the expected daytime high and nighttime low temperature that you expect to encounter?
2) What is the weather like in your area? Lots of rain? Hot and humid?
3) What is your budget for the four main items you need?
SUGGESTIONS:
1) Give us a link to a discount camping store or a place that you can order from online. We will see if there are any good products there. Gandrs was the only gear store I could find in Latvia that has a good website. Are there others?
2) Look online, find some gear that you like, and give us the links. We will tell you what we think of your choices.