"You have a table."
Translation:Du hast einen Tisch.
"Tisch" is a masculine noun. In German, the definite and in definite pronouns (i.e "the" and "a/an") changes according to which case the noun plays. In this sentence it has the role of the direct object (accusative case, being directly affected by an action performed by a nominative noun), therefore "ein Tisch" is changed into "einen Tisch".
"Du hast einen Tisch" - correct.
"Einen Tisch Du hast." - wrong word order. In statements (main clauses), the inflected verb has to be the second element. If you start with the object ("einen Tisch"), the second element has to be the verb, so the correct word order would be: "Einen Tisch hast du". You can start with the object, i.e. say "Einen Tisch hast du", if you want to emphasize that somebody has a table (and not a chair).
Also, "du" is usually only capitalized in letters/emails/postcards, etc.
For more information on German word order, see: http://german.about.com/library/weekly/aa032700a.htm
These are all the possibilities:
Tom, du hast einen Tisch; "Tom, you have a table"
Tom und Linda, ihr habt einen Tisch; "Tom and Linda, you have a table"
Herr Präsident, sie haben einen Tisch; "Mr. President, you have a table"
*The names in the example are so you see more clearly if it's singular/plural, formal/informal
Hope it's useful :)
With "du", you have to use "hast" (not "habt"). In German, the form of the verb changes depending on the person (I, you, he/she/it ...) who does something. You can see some remnants of this in English – it's "I have", but "he/she/it has", for example.
ich habe (I have)
du hast (you [familiar singular] have)
er/sie/es hat (he/she/it has)
wir haben (we have)
ihr habt (you [familiar plural] have)
sie haben (they have)
Sie haben (you [formal singular + plural] have)
Because there are three different words for "you" in German (du, ihr, Sie), "You have a table" can be translated as:
1) Du hast einen Tisch.
2.) Ihr habt einen Tisch.
3.) Sie haben einen Tisch.
All of these sentences are correct, although you would use them in different situations. However, you can't exchange the verb forms of the three different words for "you", i.e. you can't say "Sie hast" or "du habt", etc.