First of all .. THANK Hi darren and

YOU for making this post as a newly qualified driver.

By making this post - you are displaying all the signs of a potentially good driver as you are telling us you are prepared to learn
.. evaluate your skills.. develop and learn as a CONSTANT.
I hope I impart words of wisdom in the COAST message which the Mad Doc thoughtfully re-posted.

(Mad Mogs is a medic. He's wedded to my daft foreign cousin (who's always been known to all as a lovable Wild Cat

)

We all call him the Mad Lad or the Mad Doc within the family

)
I think you have all the makings of an astute young driver because of your post. P plates can be a good idea. DO look at Pass Plus and then IAM later when you feel "ready"
You ask for advice on joining a motorway.
OK L1 is the nearside one. L2 the middle one and L3 the outside one. You have to use your system of car control when joining Slip roads (and there are some exceptions .. check out an early Mad Moggie post in March 2004! when he ranted about the Lancaster slip to M6!

)
But by and large - the slips ae designed to help you merge and blend in with the traffic. Often they are elevated. Use the height to judge the flow of traffic and speeds Use your mirrors as constant. Try to match entry speed with that of the flowing traffice You need to plan to COAST. Be aware of all cars around you. If you are joining via the outer lane of he slip road - be aware that you may block his entry by doing so. USE ALL MIRRORS AND LOOK OVER SHOULDER! as constant when joining any fast road.
You must take in all information to ensure right speed/position/gear.
SIGNAL to inform the others you are joining in. LOOK OVER SHOULDER TO BLIND SPOT!
Accelerate to adjust to speeds of the others on the road.
OBSERVATION! Takes a new outlook.
LOOK ahead into the horizon.
Scan ahead and to the rear in mirrors. ALL of them. USE them often. You only need a casual glance.
Be aware of all SMIDSY in your car and potentially other cars (Paul Smith's advice

and not mine .. SMIDSY = BLIND spot as in "Sorry Mate I Did Not See You!!") I will always credit Paul Smith for any word of wisdom as a mark of respct to a man who was on the right track - overall but like the lot of use - stuklkhad a learning curve .. but who sadly died before he could make that truly significant impact.
Monitor hat is hapening around you.
Monitor your speed/ And I will quote a paragraph now from Rad craft which SUPPORTS the late Paul Smith

roadcraft page 150 wrote:
Check the instrument. Listen to the sound of your engine. Check your speed regularly on the speedometer as it's very easy to increase speed without realising it
Road craft would appear to be at odds with policy then

It's still sound advice though and it helps us "feel the speed" perhaps?

My comment here ?
Apply your skills to date and evaluate and learn as constant