I have to ask this...
What is difference between future with future with -ecek  and future(present) with -ir?

Is future with present(ir) like in English: going to?

Thank´s in advance 

Bitirecek: He will finish / He is going to finish.

Bitirir: Sooner or later he will finish in the future.

Yarın eve gelir. There is a guess here. It is not as certain as "gelecek".

coming home tomorrow  ?

Not when you are at home

Bitirecek - he´s finishing ( kesinikle bitirecek pres.cont.) he´s going to finish & he´ll finish

Bitirir - he usually finish (present simple) sometimes