I'm a Newbie at DIY. About to buy my first set of (hopefully) good "all-rounder", versatile "staple" tools for my very first tool box. 

Have seen a multi tool, but are they really suitable for cutting accurate, straight lines?

can you find attachments that allow you to cut wood accurately, with a guide, using a blade? 

Dremle seems to have a "Straight Edge Guide" that does allow for a drill bit to cut guided straight and even circular cuts but the drill bit seems to leave the edge looking somewhat rough on the edges. 

Jobs I want to use it for include:

* Cutting the materials to build a stud wall (mainly wood batons, perhaps plasterboard)
* Cutting wood to build my own shelves and up-cycle furniture
* Possibly chase a wall (although I have heard that the multi tool might not be up to it)

Any thoughts or suggestions?