Checkpoint erstellen/löschen und einen neuen erstellen

Hallo,
Ich will mir ein Eventsystem machen und bin immoment bei den Checkpoints aber das Problem ist das
wen ich in den ersten Checkpoint reinfahre dan erstellt es einen da wo er eig nicht hin soll und da wollte ich fragen
wie ich das mache das die Checkpoints nach der reihe gehen das Problem ist halt ich habe noch nie wirklich mit
Checkpoints gearbeitet. Das habe ich bin jetzt:

public OnPlayerEnterCheckpoint(playerid)
{
Parkhauscheckpoint[0] = SetPlayerCheckpoint(playerid,2300.9216,1397.1707,10.5474,5.0); //Parkhaus_Checkpoint1
Parkhauscheckpoint[1] = SetPlayerCheckpoint(playerid,2276.9604,1455.0271,13.8700,5.0); //Parkhaus_Checkpoint2
Parkhauscheckpoint[2] = SetPlayerCheckpoint(playerid,2304.9116,1514.9944,16.9458,5.0); //Parkhaus_Checkpoint3
Parkhauscheckpoint[3] = SetPlayerCheckpoint(playerid,2340.0205,1448.7532,20.4432,5.0); //Parkhaus_Checkpoint4
Parkhauscheckpoint[4] = SetPlayerCheckpoint(playerid,2307.9238,1393.3781,23.3521,5.0); //Parkhaus_Checkpoint5
Parkhauscheckpoint[5] = SetPlayerCheckpoint(playerid,2274.8860,1468.3011,27.5152,5.0); //Parkhaus_Checkpoint6
Parkhauscheckpoint[6] = SetPlayerCheckpoint(playerid,2304.8049,1515.2236,29.7505,5.0); //Parkhaus_Checkpoint7
Parkhauscheckpoint[7] = SetPlayerCheckpoint(playerid,2340.9531,1441.0094,33.7236,5.0); //Parkhaus_Checkpoint8
Parkhauscheckpoint[8] = SetPlayerCheckpoint(playerid,2306.1804,1390.1730,36.1490,5.0); //Parkhaus_Checkpoint9
Parkhauscheckpoint[9] = SetPlayerCheckpoint(playerid,2276.9070,1440.5940,38.5355,5.0); //Parkhaus_Checkpoint10
Parkhauscheckpoint[10] = SetPlayerCheckpoint(playerid,2304.5457,1509.5698,42.5474,5.0); //Parkhaus_Checkpoint11
Parkhauscheckpoint[11] = SetPlayerCheckpoint(playerid,2327.0571,1396.1604,42.5474,5.0); //Parkhaus_Checkpoint12
Parkhauscheckpoint[12] = SetPlayerCheckpoint(playerid,2327.4670,1518.1340,43.4375,5.0); //Parkhaus_Checkpoint13
Parkhauscheckpoint[13] = SetPlayerCheckpoint(playerid,2326.9553,1638.4944,10.3990,5.0); //Parkhaus_Checkpoint14
Parkhauscheckpoint[14] = SetPlayerCheckpoint(playerid,2267.9175,1772.7914,10.3990,5.0); //Parkhaus_Checkpoint15
Parkhauscheckpoint[15] = SetPlayerCheckpoint(playerid,2125.4468,1774.3383,10.3990,5.0); //Parkhaus_Checkpoint16
Parkhauscheckpoint[16] = SetPlayerCheckpoint(playerid,2065.0183,1642.8192,10.4009,5.0); //Parkhaus_Checkpoint17
Parkhauscheckpoint[17] = SetPlayerCheckpoint(playerid,2064.2466,1340.5258,10.3990,5.0); //Parkhaus_Checkpoint18
Parkhauscheckpoint[18] = SetPlayerCheckpoint(playerid,2167.9409,1193.5818,10.3990,5.0); //Parkhaus_Checkpoint19
Parkhauscheckpoint[19] = SetPlayerCheckpoint(playerid,2187.7637,1322.5112,10.3990,5.0); //Parkhaus_Checkpoint20
Parkhauscheckpoint[20] = SetPlayerCheckpoint(playerid,2275.2490,1371.8414,10.3990,5.0); //Parkhaus_Checkpoint21
Parkhauscheckpoint[21] = SetPlayerCheckpoint(playerid,2365.8374,1456.7344,10.3989,5.0); //Parkhaus_Checkpoint22
Parkhauscheckpoint[22] = SetPlayerCheckpoint(playerid,2312.4797,1486.4755,10.5505,5.0); //Parkhaus_Checkpoint23
return 1;
}

Und wie arbeite ich mit IsPlayerInCkeckpoint ?