1. Don't bother about bad bidding

a. You can equalize bad bidding by excellent play.

b. You may find a lucky distribution of opponents cards.

c. Opponents make mistakes in defending

2. Be aware the bidding has two goals:

a. Reach the best contract for yourself, without telling opponents too much about your holding

b. Disturb the opponents bidding

3. Be aware: Distribution and fit are much more important than HCP.
HCP are for balanced distributions and for unbalanced as a rough guide only.
READ: Marty Bergens "POINTS SCHMOINTS"

4. Bid as simple as possible

5. Agree with your partner a very simple, easy to learn system.
Sophisticated gadgets are of no great use to a beginner or intermediate.

6. Recommended tactics:

a. Be aggressive in the part-score battle

i. Open every hand according the 18-rule (Add up your HCP + the length of your two longest suits)
i.e. A109xx, KQ108x, xx, x is a very nice 1 spade-opening with 19 points for the 18-rule.
I open every hand with good suit(s) if the points add up to 18

ii. Overcall very light with a good suit

b. Be very aggressive in bidding games (esp. at IMPs)

c. Be conservative in bidding slams

d. Be aggressive in doubling opponents, if you have bad news for them because you got unexpected trump tricks such as QJ109. If you have AKx opponents know, that these are missing.

e. Be very aggressive in preempts with good suit(s)
Preempt as high as you want to go at once.
Bid preempts with good suit and few (better no) defensive value.
Be aware after a preempt partner is the captain and you have to obey, because you told your full story