If you plan to use a CAD Package for Design-Build documents (Plans), then you are better off using a "Compatible" Package - such as AutoCAD (or similar Applications from Autodesk).
[*] Ability to exchange drawing files with other CAD using personnel,
[*] Understanding of terms and methods used within the environments, when discussing drawing files with other CAD users - either within your firm or other trade firms,
[*] Edits to "Base" Floor Plans may be done simply by replacing the existing Base Plan with the revised Base Plan,
[*] Layers, Layers, Layers!
Since you are beginning and do not plan to apply a lot of "Power Tools" to the CAD Package, the "LT"
version of an AutoCAD Release will suit you just perfectly.
I am not going to beat around the bush regarding the amount of learning involved - it is quite indepth!
But there is a myth about how much difficulty is found overall.
For the most part, going from a Mechanical / Hard Copy state of drawing into a CAD Environment may be the most difficult step of all.
In a CAD Environment, everything may be drawn at scale - meaning 1 foot actually equals 1 foot! There is no pre-formatted need to contemplate a scale size per the media used to print to. The scaling comes when the drawing is to be Plotted (Printed / Hard Copy).
The best thing you will do at the very beginning of any drawing job, is what you do not need to do!... Set Up Your Blank Media!!!
No more taping down vellum, drawing borders or filling in multiple text boxes.
Even better than the end of tedious setups, are the end of annoying routines like:
Drawing "Light Lines" with 4H or 6H leads, then using an eraser to clean up over traced lines; no more "Bolding Trace Lines" with 2B or 4B leads; and the best of all points:No More Frikken T-Squares, Triangles And Stencils To Deal With!!!
As far as scale accuracy goes, no CAD Package is any more accurate - or less accurate, than its Hand Drawn counterpart - provided the Draftsperson has applied the proper dimensions.
In reality, a well seasoned Draftsperson may have a more accurate Hand Drawn Plan, than the CAD version!
It is really easy to screw things up big time with a CAD Package - and fixing what went haywire, may be anywhere from:
"Kind Of Hard", to "Extremely Difficult", upto "Virtually Impossible / Start The Whole Thing Over From Scratch"
Within the powers which make the CAD package the extremely powerful tool that it is, also lies the ability to totally mess things up with the greatest of ease!
Learning the basics is best done with some type of human being instructor - such as a Friend / Relative / Co-Worker whom is somewhat a seasoned CAD user.
Instruction for the "Basic Basics" may be found at Community Colleges and ROP / Adult Continuing Educational options.
After grasping the "Basic Basics", it will be more effective to advance your CAD abilities from the many, many, many-many-many books available for purchase.
If you keep with it, in one year's time, you will be hunting the CAD Shareware sites, downloading tons of .SHX fonts, downloading hundreds of Blocks (along with creating your own), trying to build / find the "Killer VBA / AutoLISP Scripts" (or tweaking the heck out of what you already have), and waking up thinking of something cool to try - which might / might not save time...
I wish you the best of luck on this.
BTW, I went from being an 8 year veteran Hand Drafter, right into a CAD Package, and never looked back!!!
It was mind boggling at first, but after getting the "Basic Basics" down, everything finally made sense!
I still have all my Manual Drawing Tools like:
Drafting Machine(s), Table, Stencils, Triangles, Graphicals (Berol, Staedtler / Mars, Zebra and Fullerton fixed lead and Mechanical lead devices), and all the editing / cleaning + pointing tools.
Someday plan to use again, but will do all the setups in CAD, plot the base page, then fill-in by hand.
Feel free to contact me if you have questions regarding CAD "Stuff".