The International Football Association Board (IFAB) writes the Laws of the Game (LOTG) that FIFA adopts for International, World Cup play. The laws are published on 1 July of each year and available at http://fifa.com/. The field is described in Law 1.
As you called it "soccer", we presume you are from the USA, Canada, or Australia. In the United States, the National Federation of High Schools (NFHS) and the National Collegiate Athletic Association (NCAA) have their own rule books for each sport including soccer. Their soccer rule books follow pretty closely with the field dimensions and markings as described in the IFAB LOTG Law 1 but there are differences. Youth soccer, as oversee by American Youth Soccer Organization (AYSO) and US Youth Soccer (USYS) follow the LOTG except they shrink all dimensions for players under 16 years of age.
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The short answer is - you can't. No player on a soccer field has a fixed position in terms of the field of play. Even the goalkeeper, who normally spends most of the time in her/his team's own penalty area, is allowed to go anywhere on the field if s/he wants.
At the start or restart of play, each team is located in their own half of the field but once play is under way each player is free to roam anywhere on the pitch and many do so.
While the playing positions can be broadly split into three areas: defence, midfield and attack, there is a great deal of variation and flexibility on where any particular player or position might be located on the field at any given moment.
In a standard 4-4-2 configuration: Striker, Midfielder, Defender, Goalkeeper In a 4-3-3 configuration: Forwards, Midfielder, Defender, Goalkeeper In a 3-5-2 configuration: Forwards, Midfielders & Wingers, Defenders, Goalkeeper
1, 2, or 3 strikers (attackers) up top
1, 2, or 3 center midfielders
2 outside midfielders
4 defenders
1 keeper
Striker and center mid numbers should equal 4.