If we possess 'free will' then does Yahweh have a plan. If it does have a 'plan' how could there be free will, it would alter its plan.?

We don't possess free will at all. It's an illusion. DNA and chemicals determine our personality, which determines our choices.

He does have a plan. He created you as He wished and expects you to follow His truth.

God knows what COULD happen in ALL possible situations, and has a plan for each and every possibility.

God does not know what WILL happen until, though the realization of your Free Will, YOU finally decide to make a choice, which then eliminates all there possible choices.

No matter WHAT your Free Will choice, God has a plan ready for that situation, but His plan is not implemented until YOU Free Will Choose the path to take.

He has waited patiently for thousands of years to get enough righteous people to fill the earth. When he has what we wants he will destroy the wicked and resurrect the righteous ones to eternal life on a paradise earth. www.jw.org

God does have a plan. You can be a part of it or not, that is where your free will comes in. The Bible says in several places that God's purposes can not be thwarted so there will always be an alternate way for them to be carried out no matter what humans choose to do.

Who is "Yahweh"? If you mean the God of the Bible, [Yehowah] then perhaps you can first of all show where "Yahweh" has any fit anywhere either linguistically or textually in Hebrew [clue: it doesn't].

No, Yehowah [Jehovah when Anglicized] doesn't "have a plan."

Plan: "An account of intended future course of action (scheme) aimed at achieving specific goal(s) or objective(s) within a specific timeframe."

God doesn't "aim at achieving" anything. Unlike humans whose plans can fail with even the best of intentions, that cannot be applied to God. When he purposes something that he delights in, then according to Isaiah 55:11 that becomes his unchangeable purpose.

Your comment, "If it does have a 'plan' how could there be free will, it would alter its plan.?"

That is a logical non-sequitur. It does not follow that because you have a plan, the actions of others somehow "alter" your plan. That could happen, but as I explained, God doesn't purpose things in which he delights so that they are destined to fail because of the actions of others [angels or humans].

Free will allows us to embrace what God purposes for our benefit, or not. It is our choice whether to do so.

Hope that helps, and thanks for your question.

My dad had a plan for my future. Send me to school. Then send me to university. Did that conflict with my free will? No. Because I still had the choice of whether I wanted to learn or not, or go along with that vision my parents had for my life. I chose to get an education.

It's not different with God. God had a plan and a purpose for Israel. To be the means through which 'justice is established on the earth"(Isaiah 42:4) and to be "a light to the nations, to open the eyes that are blind, to bring out the prisoners from their dungeon, from the prison those who sit in darkness"(Isaiah 42:6-7). That doesn't conflict with God also giving human beings free will because he also says "I call heaven and earth to witness against you today that I have set before you life and death, blessings and curses. Choose life so that your and your descendants may life"(Deuteronomy 30:19). Sometimes they chose to disobey God and were punished(Leviticus 26:14-46). At other times they followed God and were blessed(Leviticus 26:1-13)

This is a great question that blows Yahweh out of the water.

Christians never do seem to think that one through, do they?