To get infinite money and respect, you have to complete the 1st mission, then save the game and quit before answering the phone. Now you have to reload your saved game to get $500 and 500 Respect points. Actually, you can repeat this trick as many times as you wish. Every time you will get 500 Respect points and $500.
To get infinite money, you have to enter a hotel, nightclub, shop, or whatsoever that you own. Smash the cash register and get the money. Get out of there and enter once again. Yu will find your cash register fixed. Repeat this trick as many times as you wish.
Complete the indicated task to get the corresponding number of GamerScore points:
First Sign of Respect (5 points): have Respect Level 10
Gaining Respect (10 points): have Respect Level 20
Making an Impression (15 points): have Respect Level 30
Demanding Respect (20 points): have Respect Level 40
Jack of All Trades (25 points): have Respect Level 45
Public Enemy Number One (50 points): have Respect Level 50
Assassin (10 points): get 5 Execution Styles
Petty Theft (10 points): crack 10 Safes
Negotiator (5 points): bribe a Police Chief
Smuggler (10 points): get 10 Racket Trucks
Real Estate Investor (10 points): buy a Safehouse
Bodyguard (10 points): gire a Crew Member
Earner (10 points): extort 10 Businesses
Enforcer (10 points): take over 5 Rackets
Arms Dealer (10 points): buy a Firearm Upgrade
Neighborhood Control (20 points): take over a Neighborhood
For the Family (25 points): finish all Missions
Contract Killer (25 points): finish all Hits
Service Provider (25 points): finish all Favors
Knockout King (15 points): win a Prize Fight
Entrepreneur (15 points): get 10 Film Reels
Front Man (50 points): take over all Fronts
Real Estate Mogul (20 points): buy all Safehouses
Bank Robber (10 points): heist all Banks Once
Heavyweight Champ (25 points): win all Prize Fights
Safecracker (30 points): crack all Safes
The Don (25 points): have Don Rank
Don of NYC (50 points): have Don of NYC Rank
No More Narcotics (30 points): bomb all Drug Rackets
Warehouse Wrecker (30 points): seize all Warehouses
Transport Takedown (30 points): seize all Transport Hubs
Rival Family Elimination (40 points): destroy all Rival Compounds
Diplomat (20 points): help all Merchants
Total Domination (50 points): extort all Businesses
Forced Entry (10 points): heist a Bank
Demolitions Expert (10 points): bomb a Business
Executioner (40 points): finish all Execution Styles
Debt Collector (30 points): get all 100 Film Reels