Hi Jorge,
Welcome to the forum, congratulations on your first Beta! As you have a 34 DMTR it must be a 2000cc car.. correct? Making your car a Series 2 Face Lift
My first advice would be get hold of the Owners manual, there should be wiring diagrams in there, if not then try a Haynes manual. I would say that both are not always 100% accurate.
Alternatively post your issue in the electrical section - bad earths are likely to be the cause of most of your issues but I would recommend breaking it down into small sections i.e. Indicators not working, then another thread on rear lights not working etc. If you try to do it all at once it will get confusing very quickly.
If you have poor running issues post something in the engine section but people are likely to suggest setting the timing to ensure its correct, maybe replace the mechanical fuel pump and then a full service. If things are still not right after that then you may need to overhaul the carb. (Kits are available to do this) or replace fuel pipes.
Any pictures of your car & where are you located?
Thank you & yes it is a 2.0L I am located in Houston Texas USA, I will try to post pics soon.