If he’s not going to pay then, well, he’s going to have to pay. Walk over and pick up a brick from the debris pile and then return to the shop window. Steal one found on the right side and pursue the fleeing van, which is marked as red on your mini-map.
Objective: Throw the object through the window to show the owner you’re serious. Return along the marked path and park in front of Vlad’s watering hole. Objective: Ram the shop keeper’s van until he stops. Your objective isn’t to kill the driver but to make the van stop. As you pull up behind the van, move to its left or right side and accelerate.
Toss the brick through the windows on the left side. Vlad has another non-paying customer—a guy who owns a laundromat on Masterson Street. Get out of the car and approach the marked entrance. It may not happen the first, second, or even third time. If the van makes a left or right turn, take the opportunity to ram straight into the side, which could topple the van and end the mission quickly. As you pursue across a catwalk, he’ll slip and hang precariously off the edge. You’re driving Jacob to a deal…but Jacob is a little paranoid.
Not long after you drop Roman off at the cab depot, he sends a text message. Drive to the cab depot and find Roman getting roughed up by Albanian loan sharks. Get inside Roman’s car and drive along the marked route to the Hove Beach subway station. After dropping the girls off, Roman phones and suggests hitting a clothing store to update your threads. Sprint to Roman’s car; wait for Roman to hobble over and get into the passenger seat. She loves games, such as pool or darts, and it may only take one more date to try your luck. Vlad decides to boss you around a bit but you stand your ground. Park the car at the marker and wait for Jermaine to approach and get inside. Jermaine needs to deliver stolen goods and he decides to trust your driving even though he expected Roman for this run. You’ll find Little Jacob outside The People’s Park. Once inside the taxi, Little Jacob provides a new destination. Follow the marked route to Little Jacob’s destination. When you reach the overlook, spot Little Jacob on the far side.
After the fight, Roman wants your help in picking up Mallorie, his girlfriend. This Russian style clothing department is back near the safehouse. Follow the tutorial instructions to punch, kick, counter, block, etc. Take ‘em down one at a time to complete the objective. Roman finally arrives and saves you from more of Vlad’s blabbering. Along the way, he gives you a pistol—apparently he may need some backup. Proceed to the lookout spot and watch for any "badness". Crouch and aim your pistol in his direction and prepare for the "badness". Vlad wants you to shake down some guy who owns a china shop—the guy owes Vlad some money.
This Gamespot game guide to Grand Theft Auto IV features: This section provides walk-throughs for all of the single-player story missions.
Note that many of these missions can be completed in a different order than the one presented below.