Merhaba dostlarým

How does the future tense work, for eg. I will go, I will eat, I will sleep etc

Terseküler

Generally, you have to follow these steps:

• Make verb root by taking a verb and removing "-mek" / "-mak" suffix (examples)
  
  gelmek (to come) -> gel
  söylemek (to say) -> söyle
  uyumak (to sleep) -> uyu
  kalmak (to stay) -> kal
• You append "-(y)ecek / -(y)acak" suffix to a root. ´y´ is a buffer letter here, you have to use it if a root ends with a vowel, and after it you append "ecek/acak" ; otherwise, you simply append "ecek/acak". The choice between "ecek" and "acak" depends on vowel harmony.
  
  gelecek -> Last vowel of root is ´e´, so we use "ecek"
  söyleyecek -> Last vowel of root is ´e´, and root ends with vowel, so we use "yecek"
  uyuyacak -> Last vowel of root is ´u´, and root ends with vowel, so we use "yacak"
  kalacak -> Last vowel is ´a´, so we use "acak"
• You append personal ending:
  I - im   you (singular) - sin  he/she/it - (no ending),
  we - iz you (plural) - siniz   they - lar
  
  (you have to apply vowel harmony to this suffixes too)
  
  Because of consonant mutation, if suffix starts with i or ý you also have to change ´k´ letter in "acak/ecek" suffix into ´Ã°´. So for example:                              
  
  geleceksin - you will come
  söyleyeceðim - I will say (k transformed into ð)
  uyuyacaksýnýz - You will sleep (notice that siniz changed to sýnýz because of vowel harmony)
  kalacaðýz - We will stay (k transformed into ð)
  
  Maybe it would be easier for you to replace two last points with one: append one of the following suffixes depending on person:
  
  I - eceðim / acaðým
  you (singular) - eceksin / acaksýn
  he/she/it - ecek / acak
  
  we - eceðiz / acaðýz
  you (plural) - eceksiniz / acaksýnýz
  they - ecekler / acaklar

You can also look here for explanation: http://turkishclass.com/turkish_lesson_70
By the way - I really recommend to you reading "Learn Turkish / lessons by admin" on this site, I started from this and it is really valuable resource for me (for example, tenses, vowel and consonant harmony are explained there) . Also, you may be interested in "Manisa Turkish" site, which is currently available in archived form here:

http://web.archive.org/web/20080202222619/www.turkishlanguage.co.uk/index.htm

And I guess you will find this program very helpful:

http://ipb.nu/winmekmak/

It lets you for example type verb and see how it looks in different tenses - it is really great tool!

I hope I didn´t make anything wrong here good luck with your learning !

thank you so much for your help