is it possible to make a game without tiles and be 2d? I made a house before I considered tile sizes and I still am not sure how to mke tiles. Linking images together for a map and placing stuff on a ground sheet will be hard for me, and tiles will be only harder if I plan to use vector at all.

It is possible to make a 2D game without tiles, but whether it will work for your players depends on what genre of game it is. But tiles are actually a really easy way to make graphics if you plan ahead a little bit. Although the nice thing about vectors is it's easy to adjust several premade pieces of vector art to have compatible proportions, something you can't do very well with bitmap art.

What genre of game are you making now? Because if it is the kind of game which has humanoid characters that walk around, you really should establish the proportions of one of them first, make an example one out of simple geometric shapes, and use that to establish the proportions of the rest of the game.

It'll be an adventure game, kind of an rpg depending on how you define it. It will have human characters that walk and dungeons and towns. I hope this helps!

Have you made a feature list yet? That's another thing that should be done before trying to make the art. For example, can the playable character pick up or push objects? Is there combat, and if so is it action/arcade style or turn based or what, and does it happen integrated into the game's exploration mode or in a separate combat mode, and if the latter, are the spawns random and invisible or fixed and symbolically indicated?

But basically if you want anything remotely like a Zelda game I would go with tiles. Having decided that, then you make your mock-up of a standard character as I described in my last post, then you make a mock-up of your screen with the playable character and some NPCs at the size you want them to appear in the game's exploratory mode and also whatever gui/menu items you want to be visible in that mode. Then finally you can draw a grid showing how big your tiles and the background should be, and start designing particular screens, first doing the basic tiles like grass, wall, whatever is going to be very common in the game world.

Well, on Golden Sun I've noticed a few things

1) Your tiles don't really measure a character's step if they walk up or down

2) you can walk on and under bridges

3) there are different floors. Let's say there's a platform on my floor and a floor up there is an area to jump to. I cannot jump to the area from my floor. How do you set these restrictions?