As Grumpy has quite rightly pointed out, checkering a stock is often described as
"The last, best way to ruin a stock".
That is a true statement. I am saying that not to dissuade you from attempting it, or paying someone else to do so, but there are a few steps before that.
The first thing you can do to your stock is to remove the finish and any dents in the wood, then sand and apply a nice hand rubbed finish. Plenty of information on the internet on how to do that, and I am sure there are videos as well.
After your stock is finished in a manner you are proud of, should you like to checker it yourself it is actually rather simple. Just buy some of the tools (they are not that expensive) and first practice checkering some drink coasters for your coffee table. When you have checkered 6 coasters get 2 or 3 hammers and checker the handles.
Once you have checkered 6 coasters and 2 hammer handles you should be experienced enough to carefully do your gun stock and have it look nice enough that you can be proud to show it off. If you do not take the effort to do that, mark my words you will be burning your stock in a fire at midnight and hoping no one sees it before you toss it in.
Here is a labor sheet that I took off the web, no relationship with the stockmaker but it gives you an idea of the time involved for an
experienced professional to do the job right.
http://www.cgm-gunstockcheckering.com/H1.htm
Anyway, my suggestion is to start with a refinish that you can do yourself and go from there.
"What if he had no knife? In that case he would not be a good bushman so there is no need to consider the possibility." H.A. Lindsay, 1947