OK - some good coraline algae (the purple stuff), but also a few pests to get rid of before you go much further.
In the first picture you can see some bottle green spheres - these are Valonia - a form of green algae that can become a real problem (although they are interesting in that they are the largest single celled organism (I think)). Turn you pumps off and pluck them off like grapes - don't squeeze them too hard or they will pop and release spores. Use tweezers gently on the little ones.
The fourth picture showns aptasia - those little brown anemones. They are a real curse and will cause you no end of problems if you don't eradicate them. They sting other corals and grow at plague proportions. There are a million different cures, but basically you need to kill them in situ - if you cut them, squash them, etc. then new ones will grow from whatever tissue remains. The cheapest option is to squirt them with boiling water (cook them), but that causes quite a bit of collateral damage (it will kill the good coraline algae). The best but most expensive option is 'Joe's Juice', which you feed them as per the instructions. I have a 100% kill rate using that (on all of the three aiptasia I've ever had :lol: )
Deal with these now and then you can get on with developing your tank - if you ignore them they will become a constant hassle Have fun!