Yes it is very important to make sure to not lose your focus. Just remember what you are going to college for it's to get a degree. Yes in between you will meet a lot of people and maybe fall in and out of love and have other things that might seem important at that moment, but in the end if you are spending all this money and time towards a goal your number 1 priority should be to give 100% to your classes. Additionally, it is not as easy as it seems because it means you might have to say no to hanging out with friends or sometimes miss family events. Lastly, just remember it is not easy for your parents to let you go from home and live alone remember they are also making a sqcrifice; but they know this is best for you and your future that's why they make that sacrifice, pass or fail you will always have their support.
As far as planning goes it is easy to plan
1. Make a schedule for classes
2. Add time for studying
3. Schedule breaks between studying to debreif
4. make time for family/friends and other social events that you "need" to attend to
5. Give your self a break every now and then to do things that make you happy (twice a week at least)
6. Leave yourself time to sleep (very important)
The hardest part is sticking to the schedule. Yes priorities might change depending on the week/day but don't create bad habbits for example, leaving todays work for tomorrow (papers not due till next month I will work extra some other day to get it done). If you miss your work today tomorrows schedule needs to be adjusted to make up today's work.
Don't forget to ask for help there are numerous resources and support system built for your success from family to councelors take advantage of them all take some weight off your shoulder.