To the OP: There’s a lot of good advice already. Some stuff hasn’t been said so far:
Assuming you don’t have all the time in the world, practise more frequently, for shorter periods (eg. 2 x 15 minutes is better than 1 x 30 minutes, 2 x 30 minutes instead of 1 x 1 hour, etc.). Otherwise, if you just do one or two big sessions per week, aside from it being very physically challenging/tiring, you’ll have forgotten a lot since last time, so you’ll be spending a fair chunk of each practice session re-learning, rather than practising.
Well, it depends upon what you want to get out of it. If you want to go beyond the level of strumming some sing-along type songs, then learn some music theory too, starting with scales. Theory is a bit daunting at first, but it will start to make sense and it will really open things up for you. Scales can be boring (although you can mix up different ways of practising them), but they are the basis of everything else and well worth the time. On the other hand, if you just want to be able to play some songs, then just learn some easy songs. There’s no use suggesting that you have to know a diminished-whole tone scale or practise tritone substitutions unless you plan to hit the jazz circuit when you just want to play a Beatles song, for instance.