Hello everyone!
Finally I come to Golden Skate again after who-knows-how much time has passed, due to many personal problems...

Anyway, I wanted to add my comment to these questions. I'm still at the starting way of skating, but as far as I am concerned for a good start you will surely need some good equipment such as proper skates (my boot level is Edea Overture for example), which by themselves require a medium-high cost, and the skates shouldn't be whenever you choose them but they must perfectly fit on your foot, so maybe you will need a boot skate that costs much than you expect.
So, as in the past I have received many good advices, I too suggest you to visit a professional skating store for choosing the right skates and to start step by step with lessons and warm-up exercices because since you are 18 it's a must to start gradually and NEVER push on too much your body anyway. I started to skating a year ago and I can assure you, you MUST get the things slow and with the right time. This doesn't mean that you are not able to get great goals, but that you may reach them with more time than someone who started skating at 3 or 5 years old. In fact, I know there are plenty of people who started at your age or even more and now are called "adult skaters", and they are even competitive. I suggest you to look for them too, so maybe they will give you many adivices too.
I wish you all the best in your skating journey, and don't forget that you can always improve further that you imagined