Start with standard cube notation — the letters R, L, U, D, F, B for face turns — and a beginner layer-by-layer tutorial. Solve the first layer intuitively, learn two short algorithms for the middle layer, then a small set for the last layer. Most learners complete their first full solve within a day and can solve unaided within a week.
To get faster, add a timer and log every solve. Once your average drops below about 90 seconds, begin studying a speedsolving method such as CFOP, starting with the cross and F2L pairs before memorizing last-layer algorithms. When your average is under a minute, you are ready for a WCA competition — the calendar on worldcubeassociation.org lists upcoming events, including those in Turkey.