Planning the kitchen is very important, this is because a wrong placement of kitchen furniture and it could mean walking 5 steps for every little utensil, you really don't want that. My advice is to make a brainstorm, put all your appliances that you use and group the ones that are most often used together. After you have grouped them, then you should decide where the group is going to go. Now you should design the kitchen interior. I have learnt from my experiences that it is much, much easier to group the appliances and then remodel the kitchen interior accordingly, as this saves time and any unnecessary mistakes. Also remember to try and give as much spare space to every group. This can be quite difficult for small kitchen but is very important.
Completely remodeling the kitchen interiors can be a hard task, and it is often better to avoid it completely and just rearrange the kitchen furniture. that being said, if you can design it perfectly you could make the valuation of the house rocket up.