Memorize the algs with muscle memory, it's faster. Do the PLL's first, and don't start learning full OLL until you know full PLL.
Learn them in order on a printed list of all the algorithms.
Start by looking at the algorithm and doing it many times in a row, on a solved cube. Keep practicing the same alg over and over again.
Then do it some more times without looking at the paper. Look at the cube when doing it to look at how the pieces move it you want. Basically just do the alg over and over again.
Then make sure you know when exactly to use it (by looking at the picture of the case provided), and recognizing it when it comes us. When you get a PLL case to solve, don't look at what pieces need to be solved, but the already solved pieces. Look for the shapes and patterns of the solved pieces to see what case you have, instead of tracing the unsolved pieces to their destination with your fingers like a typical beginner.