Skills:
S&L to within 5 degrees and 50' consistently
Steep turns with no height gain/ loss
DR navigation en-route with justified hdg corrections (i.e. not map crawling)
R/T discipline
PFLs
Slow flight and stalls in all configurations
Intercept an NDB, fly to it and from it on given tracks
Calculate TO and Ldg distances, using appropriate safety factors
Fly S&L, level rate 1 turns, straight climb and descent on full and limited panel (take a safety pilot).
Max performance TO and Landings
Fly accurate circuits/ approaches in all configs
'Projects':
Find out what attitude and power setting is required for S&L flight at speeds in 10kt increments between 1.2 Vs and Normal cruise speed.
Using a DME - work out how many miles to change speed by x knots (say 120-80 for example)
Read your aircraft's POH cover to cover
Find a piece of uncontrolled sky and find out the service ceiling of your a/c (remember you need oxy above 10k')
Get complex differences training and learn about wobbly props and dangly gear
That's something to start with anyway...
Remember - you should seek the help of an FI with some of these - if in doubt it's always better to ask...