The only device you technically need
to turn up the boost is a boost controler. Manual ones are cheap, electronic more sophisticated and expensive. Having said that i would not turn up the boost without a way to monitoring for knock at a minimum, and ideally AFRs. For the former, you need some way to datalog/connect to ECU. For the latter, you need to install a wideband O2. Unless you are planning on upgrading injectors, you don't need to (and wont be able to without installing much more) do any tuning.
You need to make a decision now how far you are going to go with the car (just a BC? more bolt ons? upgraded injectors/piggyback/flashable ECU?) and that will determine which path you should go down and if you should invest in more now or just keep it simple.
If you want to read all about my datalogging setup you can do so here: Datalogging using Torque Pro App and BlackStealth’s OBD1...
Before considering any of that, make sure all your maintenance is up to date and the car is otherwise healthy.