But i have a board size that i have to follow which is 3.1 by 5.7 cm so this cannot be done in a 2 layer board so im doing a 6 layer board.
And yes i don't understand many of these things because i just started using this software and this is a school project which is not really related to my course. And i'm still studying in Polytechnic. So i'm asking for help here as this needs to be completed in 3 months and i have other boards as well. (+ soldering, testing, report, presentations)
Sorry if i posted on the wrong category
Then you are basically screwed.
Begin with drawing a clean schematic and creating all footprints.
This board is packed with stuff. It can be done on 4 layers. Top layer, ground plane, power/ signal grid and bottom routing.
Once you have all footprints : do a placement excercise.
I would not say screwed...
If you have already made the jump to 6 layers and are ok with the cost of doing so, thats your choice. Can this be done with 4, most likely... Will it be easier to route 6 layers, of course. Will the results be better with 6 layers, probably not, but maybe in some instances. You can always start with a 4 layer stack and add 2 layers if needed or start with a 6 layer stack and remove 2 layers if you don't end up using them. All depends on what motivates you.
For a 4 layer board, you can't go wrong with a top/gnd/pwr/bottom stack where you try to do the majority of placement and signal routing on the top, decoupling, a minimal number of jumpers other stuff on the bottom. Analog circuits always have a nice signal flow so this should be fine.
6 layer you could do top/gnd/sig/sig/pwr/bottom or top/sig1/gnd/pwr/sig2/bottom like you mentioned. Each have pros and cons. I would probably choose the latter if it were me, the con is that you can have signal coupling between top and sig1 you you are not careful.
In general, @free_electron is right and saying that floor planning and component placement needs to be done first, place components how the signal flows throughthe schematic and try to reduce the snarl of rats nest as much as possible to minimize intersecting rats.
When you do that, post a screen shot and then talk more about stackup.