Most beginners who "slice" are the results of "over the top swing path."
This starts with several swing patterns a beginner will develop without taking proper lessons or guidance.
I would suggest searching this site for "corrections" which members have posted.
Both Eric (iacas) and Mike (mvmac) have posted many videos to this site which will give you a great visual to learn from.
Basically, a correct swing path is required to make "Square impact through the ball", for a player to hit the drive straight.
As an example, place an extra tee just slightly outside and slightly behind the tee ball.
Also place a third tee to the inside front of the tee ball.
When you hit this shot, you will probably hit all three tees.
A player who can hit only the tee ball without hitting the outside and inside tees, should hit the ball straight.
You can also practice by placing tees in the ground to indicate the proper swing path.
Also, I would suggest seeking lessons to help guidance with learning the basics.
Lessons will help you advance quicker and eliminate frustrations which will occur trying to learn the basics on your own.
Welcome to this great game ! There will be times of rewards, and times of frustration. But stick with it. Most people that I see that slice the ball swing the club outside-in. The way I cured it ( at the driving range ) was to put a shoebox just outside of the ball, far enough so the clubhead can strike the ball. When you get tired of hitting the box, you'll be swinging from the inside. I know there are other reasons for slicing, but this drill really helped me. Too bad I cannot use my box on the course !!!
will keep trying! played my best ever round today (109!) so getting better all the time. previous best round was 120 and I hit far less duff shots with my irons today as they are really improving. still hit most drives right but feeling more comfy with the new 10.5 ping so will keep practising with it. had my handicap calculated today on my last three rounds and I'm 28, as I understand it, you can't get worse than that so it can only improve :)