Yes, double ditto to Lyric.
The Rider Waite Smith deck is a good deck to start with because it is the clearly understood, symbolically simplistic and it is the deck many decks are based on. Recommend you do a bit of reading about Arthur Edward Waite and Pamela Coleman Smith.
You can have as many decks as you wish, but keep your 'deck collecting' a side line from your 'deck study' at the moment.
The basic you need to understand are:
- the majors and their basic meanings
- the courts and their basic meaning
- the pips and their basic meanings
Understand the meaning of the numbers 1 - 10 and the significance of the number 0
Understand the 4 elements -
Wands - Fire - Spirit
Cups - Water - Emotion
Swords - Air - Intellect
Pentacles - Earth - physical
As Lyric recommended - 1 card daily draws and 3 card spreads..this is the best way to get familiar with the cards and the way they work together.
Bad luck...again as Lyric pointed out...just myths. Care for your deck and keep them safe. Always wash you hands before you handle them and make sure the space you are spreading is clean and dry. Recommend you get a nice spread cloth.
Hope this helps.