Pianos are offered at different prices and qualities. The differences are found in the materials used such as the wood, hammer heads, strings quality, and different production methods. Put simply, you could say that as the price increases so to the quality of the sound, the precision of play and with that the expressive qualities of the instrument increase. For a beginning this means in what way, or to which degree of sensitivity can your finger and hand musculature be trained.
A piano 'feels' most comfortable at about 20 degrees Celsius with a humidity of around 50 percent. Additionally you should make sure the instrument is at least 3 meters away from any heat source and that it receives no direct sunlight. Drafts as well as any other factors that influence the temperature of a room, will also influence the instrument.
Many manufacturers suggest bi-annual tuning for the first five years. Afterwards once a year will be enough, but this should also be decided on an individual basis. The first mechanical over-hall will probably be necessary in 4-6 years. The playing mechanics will be disassembled and reworked.
Well, a normal piano is the original. A digital piano only simulates one. The sound of a piano is normally livelier and warmer, since the instrument is made from organic materials (wood, felt, metal). The digital simulation of a piano will often sound synthetic and less lively. Additionally, the hammer mechanic simulation of digital pianos is a point of criticism. However, not every piano is better than a digital version. You have to consider it on an individual basis (age, technical quality, possibility to play with headphones, maintenance costs etc.).