Lack of accuracy (for a beginner) with a spring pistol may put you off the game.
The Umarex CO2 are cheap enough to run if you buy your CO2 in bulk, but apart from the S & W 6" & 8", accuracy isn't very good and neither are the triggers (another problem for a beginner).
For a cheap, accurate pistol, get a Gamo PR45 or if you can stretch the budget further, a Gamo Compact. A Compact is capable of getting you well up in any club level 10m competition. When your average is over, say 85, decide which way you want to go and take your time getting the best gun for you.