I lifted weights today on the bench and I did 5x10
Should I keep doing this? Or step it up a little bit?
To get the most effectiveness ?
This is where programing can become complicated, because a number of factors will play a role (training age, strength levels, goals, etc). In the beginning, just about anything will do in terms of increasing strength, but the focus should be on the bread and butter strength lifts (bench, squats, overhead presses, bent rows, etc). Some auxiliary movements will be included, but your focus will be on the main movements. Tens are a good place to start as they will increase your work capacity and tolerance during later training. Progression is important, but how you, as a beginner, will progress is different than someone who has trained for a number of years. Strength will come quickly, requiring a bit more work on your part on determining proper loading.
I would suggest one to two blocks of 3x10 (when I say blocks I'm typically speaking in four week blocks) as beginners need more base building. From there, you can move to heavier loads for fives and possibly threes, with exercise selection slightly varying every 4-8 weeks. If you're very new to training, periodically cycling back up to tens or 5x5 is recommended to continue building that base. Once you have some time under your belt, more advanced training will come.
For now it's all about building a solid foundation that will support you for years to come. Feel out your strength and begin to steadily progress while still allowing yourself time to recover every few weeks. This will prevent some nasty effects of long-term high volume training.
If you're interested in training for sport, Stone, Sands, Garhammer, Haff,and a few others are all good resources (and can be of use regardless). Also, if you have some college behind you, I can recommend a few books that discuss biochemistry, physiology, etc. and how everything comes together for strength and conditioning.
If general increases in strength and appearance are your thing, there are some good recommendations on here as well. And really, some of the programs would be good to check out if you aren't sure where to start.
Hope I didn't completely blow your mind!