...just search through these forums & threads......this is probably THE most asked question of all time ! You should be able to find lots of different views and opinions on what is the best cartridge/rifle combination.
Standard answer: .270 win ,30-06,.308 etc.etc.. are all good deer calibers.
Rifle: pick one you can afford AND still purchase good optics for...and one that you like(synthetic or wood,blued or stainless)and fits you well.Savage,Remington,Winchester,Tikka,Sako etc. etc.etc.
Welcome to the board and happy hunting....